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159-534: Nayarit ( Spanish pronunciation: [naʝaˈɾit] ), officially the Estado Libre y Soberano de Nayarit (English: Free and Sovereign State of Nayarit ), is one of the 31 states that, along with Mexico City , comprise the Federal Entities of Mexico . It is divided in 20 municipalities and its capital city is Tepic . It is bordered by the states of Sinaloa to the northwest, Durango to
318-633: A marine basin which separated the island arc that came to form the Guerrero terrane from the accretions that came to form the Sierra Madre terrane. It contains a lower formation made up of pillow basalts with pillow breccias , tuffs, and shales underlying a group of pelagic limestones , oozes , and turbidites . Covering the southern basement are sedimentary and metamorphosed sedimentary rocks containing argillite , limestone, volcanic schist , slate , and greywacke which were exposed in
477-416: A source of water , in an otherwise arid environment from the increased precipitation from the mountain range. As such, rivers that have headwaters in the mountains provide water for irrigation in the surrounding lands. The need for water to irrigate prompted the construction of dams, which has been the source of several environmental concerns in the area. The northern end of the range is more arid; hence,
636-421: A subtropical highland climate ( Köppen climate classification Cwb ), due to its tropical location but high elevation. The lower region of the valley receives less rainfall than the upper regions of the south; the lower boroughs of Iztapalapa , Iztacalco , Venustiano Carranza and the east portion of Gustavo A. Madero are usually drier and warmer than the upper southern boroughs of Tlalpan and Milpa Alta ,
795-448: A desert landscape. Oak forests are the predominant plant life, and extend into the lowland deserts. This forest and canyon land provided a place for a variety of indigenous people to live, until Spanish settlers with associated mestizos came into the area to found towns for the silver mines in the area. The major industries in the area now are agriculture and forestry, which have become contentious because of land degradation and
954-505: A few towns of note, including Creel, Chihuahua , with 5,000 inhabitants; it serves as a stop on the train line. South of Copper Canyon is the town of El Salto, Durango , situated along highway 40. To the west is Copala, Sinaloa . To the south live the indigenous Cora people in the towns of Jesús María and La Mesa del Nayar. In addition, 1,000 people live in the village of Huajimic in Nayarit. The Bolaños River valley of Jalisco
1113-720: A major success that ended the war. The American invasion into the Federal District was first resisted during the Battle of Churubusco on 8 August, where the Saint Patrick's Battalion , which was composed primarily of Catholic Irish and German immigrants but also Canadians, English, French, Italians, Poles, Scots, Spaniards, Swiss, and Mexicans, fought for the Mexican cause, repelling the American attacks. After defeating
1272-609: A member of the Party of the Democratic Revolution . Discontent over the election eventually led Cuauhtémoc Cárdenas to become the first elected mayor of Mexico City in 1997. Cárdenas promised a more democratic government , and his party claimed some victories against crime, pollution, and other major problems. He resigned in 1999 to run for the presidency. Mexico City is located in the Valley of Mexico, sometimes called
1431-469: A mountainous region of pine and oak trees known as the range of Ajusco . The average annual temperature varies from 12 to 16 °C (54 to 61 °F), depending on the altitude of the borough. The temperature is rarely below 3 °C (37 °F) or above 30 °C (86 °F). At the Tacubaya observatory, the lowest temperature ever registered was −4.4 °C (24 °F) on 13 February 1960, and
1590-626: A new king, Cuitláhuac , but he soon died; the next king was Cuauhtémoc . Cortés began a siege of Tenochtitlan in May 1521. For three months, the city suffered from the lack of food and water as well as the spread of smallpox brought by the Europeans. Cortés and his allies landed their forces in the south of the island and slowly fought their way through the city. Cuauhtémoc surrendered in August 1521. The Spaniards practically razed Tenochtitlan during
1749-624: A series of Paleozoic sedimentary sequences from a deep marine environment underlying it, considered by some to be part of the Cotes Terrane and by others to be transported . In some areas, distinct sedimentary rocks can be identified by shallow-water Silurian and Mississippian sedimentary rocks underlying deep-water Pennsylvanian and Permian , which are divided by Mississippian rhyolite . The Permian clastics contain some detrital rock that sit alongside low-grade metamorphosed sedimentary and volcanic rocks with serpentinite. South of
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#17327652459641908-629: A series of folds, thrust , and left lateral faults date from the middle Miocene. This may be evidence for a left transpressional shear zone . The area between this boundary and the Aguascalientes fault is filled with numerous grabens and half-grabens, as well an east–west left shear zone, the El Roble shear zone. At the west end of these grabens and half-grabens are the Pochotitan and the more northerly San Pedro fault systems, which form
2067-573: A smaller scale, mineral deposits are distributed in formations of the Sierra Madre, although the events that placed these deposits vary throughout the mountains. The Guerrero composite terrane contains many of the economic deposits, often found in ore bodies younger than the Cretaceous. Gold and silver deposits most commonly occur in the altered andesites of the early volcanics, typically these deposits are between 30 and 50 million years old. These are believed to be caused by later intrusions into
2226-686: A state of the Mexican federation, which occurred on May 1, 1917. Nayarit covers 27,815 square kilometers (10,739 sq mi), making it one of the smaller states in Mexico. Nayarit is located between latitude lines 23°05' north and 20°36' south and longitude lines 103°43' east and 105°46' west. Its terrain is broken up by the western ends of the Sierra Madre Occidental mountains. Its highest mountains are: San Juan , Sanguangüey , El Ceboruco , Cumbre de Pajaritos and Picachos . Nayarit has two volcanoes, Ceboruco and Sangangüey . In
2385-435: A summer monsoon , and two dry seasons each year. Air pressure changes in northwestern Mexico and the southwest United States are the main causes of seasonal variation in the Sierra Madre. A high pressure area that rests over the mountains in the winter begins to move north of the mountains into New Mexico during the month of June. The high pressure begins to break down and move south during September or October; however,
2544-407: A thick core covered by volcanics and eroded by numerous rivers. Some have suggested that the basement of the mountains have numerous intrusions made by mafic magma . At their surface, the mountains are made up of large-scale ignimbrite sheet that has been incised by rivers flowing from rainfall in the mountains. The surface of the plateau is almost exclusively from the second series of flows causing
2703-543: A third of those in 1992. The levels of signature pollutants in Mexico City are similar to those of Los Angeles . Despite the cleanup, the metropolitan area is still the most ozone -polluted part of the country, with ozone levels 2.5 times beyond WHO -defined safe limits. To clean up pollution, the federal and local governments implemented numerous plans including the constant monitoring and reporting of environmental conditions, such as ozone and nitrogen oxides . When
2862-488: A way not seen in other parts of the Americas. Spaniards encountered a society in which the concept of nobility mirrored that of their own. Spaniards respected the indigenous order of nobility and added to it. In the ensuing centuries, possession of a noble title in Mexico did not mean one exercised great political power, for one's power was limited even if the accumulation of wealth was not. The concept of nobility in Mexico
3021-472: A year by American troops in the framework of the Mexican–American War (1847–1848). The Battle for Mexico City was the series of engagements from 8 to 15 September 1847, in the general vicinity of Mexico City during the U.S. Mexican War . Included are major actions at the battles of Molino del Rey and Chapultepec , culminating with the fall of Mexico City. The U.S. Army under Winfield Scott scored
3180-409: Is a high plateau of volcanic rock that is eroded in areas to reveal a basement composed of plutonic and sedimentary rocks underlying the two groups of extrusive volcanics. The lower of these groups is a series of volcanic rocks formed by lava flows . The surface of the plateau is made up of a second series of volcanic ignimbrites , covered mostly by clay rich organic soils . Some intrusions in
3339-810: Is a major mountain range system of the North American Cordillera , that runs northwest–southeast through northwestern and western Mexico, and along the Gulf of California . The Sierra Madre is part of the American Cordillera , a chain of mountain ranges (cordillera) that consist of an almost continuous sequence that form the western "sounds" of North America , Central America , South America , and West Antarctica . The Spanish name sierra madre means "mother mountain range" in English, and occidental means "western", these thus being
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#17327652459643498-423: Is also a belt of iron deposits further east. Most soil in the mountains is covered by an organic -rich layer over layers rich in clay . Soils are commonly phaeozems that are up to 100 centimetres (39 in). Some soils are cambisols that are less than 2 metres (6.6 ft) deep and well- drained . Due to the high clay content, which blocks water from being absorbed into the soil, larger rock particles in
3657-486: Is colloquially known as Chilangolandia after the locals' nickname chilangos . Chilango is used pejoratively by people living outside Mexico City to "connote a loud, arrogant, ill-mannered, loutish person". For their part those living in Mexico City designate insultingly those who live elsewhere as living in la provincia ('the provinces', 'the periphery') and many proudly embrace the term chilango. Residents of Mexico City are more recently called defeños (deriving from
3816-553: Is formed by the range is cut by deep river valleys. This plateau is formed from volcanic rock overlying a basement of metamorphic rock. This uplift has caused changes in weather patterns; increased rainfall occurring in the mountains has provided areas where ecosystems can form in wetter areas than surrounding land. This water source forms watersheds that provide the arid surroundings with water that makes it possible to irrigate and farm crops. The wet ecosystems are islands of biodiversity, differing significantly from what would otherwise be
3975-461: Is marked by different volcanic processes. The first was a continuation of the Oligocene flare-up, which lasted through the early Miocene. This may be a distinct second occurrence of the same process, placing silica-rich lava above Oligocene rocks. Also in the early Miocene more intermediate basaltic andesites occur along faults and in grabens. Beginning in the early Miocene and continuing into
4134-651: Is populated with mining communities, such as San Martín de Bolaños , which has a population of around 3,000. Few paved roads cross the mountains, meaning that travel times can be long, even between cities that are relatively close. In the north, Mexico Federal Highway 16 connects Hermosillo , Sonora and La Junta, Chihuahua. In the mountains, the La Entrada al Pacifico Corridor is an incomplete road intended to connect Los Mochis , Sinaloa and Chihuahua. Durango and Mazatlán are connected by highway 40 , around 24 degrees north latitude. The Sierra Madre Occidental
4293-654: Is predominantly an agricultural state, and produces a large variety of crops such as beans , sorghum , sugar cane , maize , tobacco , rice, chiles, peanuts , melons , tomatoes , coffee , mangoes, bananas, and avocados. In addition to these crops, livestock and fishing are also central to the local economy. Approximately six percent of the land in Nayarit is pasture land, with the most common livestock being cattle, horses, pigs, goats , and sheep . Nayarit has 289 kilometers of coastline, which provides an abundance of fish and shellfish, including bass , snapper , sharks , and oysters . There are over 75 cooperatives related to
4452-594: Is the oldest capital city in the Americas and one of two founded by Indigenous people . The city was originally built on a group of islands in Lake Texcoco by the Mexica around 1325, under the name Tenochtitlan . It was almost completely destroyed in the 1521 siege of Tenochtitlan and subsequently redesigned and rebuilt in accordance with the Spanish urban standards . In 1524, the municipality of Mexico City
4611-856: The Aguamilpa Dam begun in 1991 and the El Cajón Dam upstream from it. To provide irrigation water for farming the dry basin , the Nazas river was dammed in the 1930s and 1940s. This has led to the former drainage lakes in the area drying up, and soil depletion from the elimination of the river as a source of soil. Due to the continued logging in the area, erosion on the slopes of hillsides has increased. Numerous small populations live in Copper Canyon, some of them around old missions. Many settlements consist of single families or small family groups near agricultural fields. There are also
4770-676: The Alameda Central , it is recognized as the oldest public park in the Americas . Parque México and Parque España in the hip Condesa district; Parque Hundido and Parque de los Venados in Colonia del Valle , and Parque Lincoln in Polanco . There are many smaller parks throughout the city. Most are small "squares" occupying two or three square blocks amid residential or commercial districts. Several other larger parks such as
4929-542: The Bosque de Tlalpan [ es ; no ] and Viveros de Coyoacán , and in the east Alameda Oriente [ es ] , offer many recreational activities. Northwest of the city is a large ecological reserve, the Bosque de Aragón [ ceb ; es ; no ] . In the southeast is the Xochimilco Ecological Park and Plant Market , a World Heritage Site . West of Santa Fe district are
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5088-664: The Ecobici bike-sharing were among efforts to encourage alternate, greener forms of transportation. Chapultepec , the city's most iconic public park, has history back to the Aztec emperors who used the area as a retreat. It is south of Polanco district, and houses the Chapultepec Zoo the main city's zoo, several ponds and seven museums, including the National Museum of Anthropology . Other iconic city parks include
5247-597: The Federal District (Spanish: Distrito Federal or D.F. ) and is now officially known as Ciudad de México (or CDMX ), with a greater degree of autonomy. A clause in the Constitution of Mexico , however, prevents it from becoming a state within the Mexican federation, as long it remains the capital of the country. Mexico City was traditionally known as La Ciudad de los Palacios ("the City of
5406-664: The Grand Canyon . This plateau has an average elevation of 2,250 m (7,380 ft) with most of the more eroded canyons on the western slope, due to the higher moisture content. The highest elevations occur in the Tarahumara range. The exact elevations of the highest peaks are not known within accurate enough ranges to determine their relative elevation. The highest point is probably Cerro Mohinora , located at 25°57′N 107°03′W / 25.950°N 107.050°W / 25.950; -107.050 . Estimates for
5565-438: The Gulf of Mexico . On the western side of the mountains, which are affected by the largest change in precipitation between the dry season and monsoon season, in the monsoon season rainfall can exceed 300 mm (12 in) in a single month. The southern region receives more of the rainfall than the northern. Much of this precipitation occurs as tropical storms . As the high pressure over New Mexico breaks down, rainfall in
5724-471: The Mexican wolf , Mexican grizzly bear and jaguar would have been present in the region, as well, though the bears are now extinct; the Mexican wolf and jaguar survive today only in a few fragmented locations, due to decades of hunting and human encroachment on their habitats. Most of the rain forest has been exploited, especially around the region of Santa María del Oro . The conservation and protection of
5883-719: The Naayeri (Cora), the Odam (Tepehuan) and the Nahuatl -speaking Mexicaneros . The indigenous groups mostly inhabit the Nayar highlands, but are also frequently encountered in Tepic and on the Pacific coast, where they have also established colonies. They are known for their crafts and artwork which they sell. About five percent of the state population speaks an indigenous language. Nayarit
6042-741: The Nazas River and Aguanaval River drain the mountains into a closed basin. These mountains supply 90% of the water used for irrigation within the watershed. North of this system is the Conchos River which drains into the Rio Grande . Along many rivers the arid conditions have caused courses to be dammed to provide water for irrigation. These dams have caused concerns along with those caused by other activities. The Yaqui has been dammed with three large reservoirs along its course. The Río Grande de Santiago has also been dammed, including
6201-561: The Saint Patrick's Battalion , the Mexican–American War came to a close after the United States deployed combat units deep into Mexico resulting in the capture of Mexico City and Veracruz by the U.S. Army's 1st, 2nd, 3rd and 4th Divisions . The invasion culminated with the storming of Chapultepec Castle in the city itself. During this battle, on 13 September, the 4th Division, under John A. Quitman , spearheaded
6360-618: The Sierra Madre del Sur and the Eje Volcánico Transversal (Transverse Volcanic Axis) of central Mexico after crossing 1,250 km (780 mi). The mountains range from 300 km (190 mi) from the Gulf of California in the north, but begin to approach within 50 km (30 mi) of the Pacific in the south. These mountains are generally considered to be part of the much larger American cordillera ,
6519-561: The Toltec , and Mexica (Aztecs) cultures. The latter arrived around the 14th century to settle first on the shores of the lake. The city of Mexico-Tenochtitlan was founded by the Mexica people in 1325 or 1327. The old Mexica city that is now referred to as Tenochtitlan was built on an island in the center of the inland lake system of the Valley of Mexico , which is shared with a smaller city-state called Tlatelolco . According to legend,
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6678-706: The Twelve Apostles of Mexico who arrived in New Spain in 1524, described the rebuilding of the city as one of the afflictions or plagues of the early period: The seventh plague was the construction of the great City of Mexico, which, during the early years used more people than in the construction of Jerusalem. The crowds of laborers were so numerous that one could hardly move in the streets and causeways, although they are very wide. Many died from being crushed by beams, or falling from high places, or in tearing down old buildings for new ones. Preconquest Tenochtitlan
6837-639: The Yaqui River , which drains that area, is an important source of irrigation in the state of Sonora. The Yaqui drains into the Gulf of California , as do the Fuerte River in Sinaloa and the Humaya River further south. The Río Grande de Santiago drains 100,000 km (39,000 sq mi) from the southern slopes of the Sierra Madre. Along the more arid eastern slopes of the mountains,
6996-486: The city proper was 9,209,944, with a land area of 1,495 square kilometers (577 sq mi). According to the most recent definition agreed upon by the federal and state governments, the population of Greater Mexico City is 21,804,515, which makes it the sixth-largest metropolitan area in the world, the second-largest urban agglomeration in the Western Hemisphere (behind São Paulo , Brazil ), and
7155-428: The eastern cottontail , which lives in the forests of the western slopes, cliff chipmunk , rock squirrel , Mexican fox squirrel , and various species of Cricetidae . Raccoons , hog-nosed skunk , and hooded skunk live in the mountains. The white-nosed coati lives on the western slopes, and the ring-tailed cat lives throughout. Many species of bats live in the mountains also. A variety of lizards live in
7314-566: The massacre of an unknown number of protesting students in Tlatelolco . Three years later, a demonstration in the Maestros avenue, organized by former members of the 1968 student movement, was violently repressed by a paramilitary group called " Los Halcones ", composed of gang members and teenagers from many sports clubs who received training in the US. On 19 September 1985, at 7:19am CST ,
7473-481: The most populous city in North America . It is one of the most important cultural and financial centers in the world. Mexico City is located in the Valley of Mexico within the high Mexican central plateau , at an altitude of 2,240 meters (7,350 ft). The city has 16 boroughs or demarcaciones territoriales , which are in turn divided into neighborhoods or colonias . The 2020 population for
7632-583: The tarantula species Brachypelma klaasi is found, the other being Jalisco . Home to Uto-Aztecan indigenous peoples such as the Huichol and Cora , the region was exposed to the conquistadores Hernán Cortés and Nuño de Guzmán in the 16th century. Spanish governance was made difficult by indigenous rebellions and by the inhospitable terrain of the Sierra del Nayar. The last independent Cora communities were subjugated in 1722. The state's name recalls
7791-822: The "Western mother mountain range". To the east, from the Spanish oriental meaning "eastern" in English, the Sierra Madre Oriental range or "Eastern mother mountain range" runs generally parallel to the Sierra Madre Occidental along eastern Mexico and the Gulf of Mexico . The range extends from northern Sonora , a state near the Mexico–U.S. border at Arizona , southeast towards to the Trans-Mexican Volcanic Belt and Sierra Madre del Sur ranges. The high plateau that
7950-458: The Basin of Mexico. This valley is located in the Trans-Mexican Volcanic Belt in the high plateaus of south-central Mexico. It has a minimum altitude of 2,200 meters (7,200 feet) above sea level and is surrounded by mountains and volcanoes that reach elevations of over 5,000 meters (16,000 feet). This valley has no natural drainage outlet for the waters that flow from the mountainsides, making
8109-572: The City of Lakes . If approved by the government the project will contribute to the supply of water from natural sources to the Valley of Mexico , the creation of new natural spaces, a great improvement in air quality, and greater population establishment planning. By the 1990s Mexico City had become infamous as one of the world's most polluted cities; however, the city has since become a model for drastically lowering pollution levels. By 2014 carbon monoxide pollution had dropped drastically, while sulfur dioxide and nitrogen dioxide were at levels about
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#17327652459648268-450: The Cora people's label for themselves: Náayerite , commemorating Nayar, a resistance leader. Radiocarbon dating estimate Aztatlán colonization of the western Mexican coast – including parts of Sinaloa, Nayarit and Jalisco – as occurring as early as 900 AD, with some evidence suggesting it might have been as early as 520 AD. Encountered on the western coast by the Spanish invaders in 1500,
8427-596: The Cortes and Carborca Terranes is the San José de García Terrane, which is a combination of Cretaceous arc volcanics and volcaniclastics , which may be thrusting over the Cortes terrane. The southern part of the range is made up of the Guerrero Composite Terrane, a large body, which is actually a complex of five different subterranes, not all of them within the main body of the Sierra Madre. However,
8586-633: The Gulf of Mexico and the Pacific Ocean. After landing in Veracruz , Spanish explorer Hernán Cortés advanced upon Tenochtitlan with the aid of many of the other native peoples, arriving there on 8 November 1519. Cortés and his men marched along the causeway leading into the city from Iztapalapa (Ixtapalapa), and the city's ruler, Moctezuma II , greeted the Spaniards; they exchanged gifts, but
8745-576: The Mexican wolf. Other guests are the golden eagle, pronghorn, bighorn sheep, caracara, zebras, African elephant, macaw, hippo, among others. Zoo Los Coyotes is a 27.68-acre (11.2 ha) zoo located south of Mexico City in the Coyoacan. It was inaugurated on 2 February 1999. It has more than 301 specimens of 51 species of wild native or endemic fauna from the area, featuring eagles, ajolotes, coyotes, macaws, bobcats, Mexican wolves, raccoons, mountain lions, teporingos, foxes, white-tailed deer. Mexico City has
8904-444: The Mexicas' principal god, Huitzilopochtli , indicated the site where they were to build their home by presenting a golden eagle perched on a prickly pear devouring a rattlesnake . Between 1325 and 1521, Tenochtitlan grew in size and strength, eventually dominating the other city-states around Lake Texcoco and in the Valley of Mexico. When the Spaniards arrived, the Aztec Empire had reached much of Mesoamerica , touching both
9063-403: The Miguel Hidalgo. It was opened in 1924. Visitors can see about 243 specimens of different species including kangaroos, giant panda, gorillas, caracal, hyena, hippos, jaguar, giraffe, lemur, lion, among others. Zoo San Juan de Aragon is near the San Juan de Aragon Park in the Gustavo A. Madero. In this zoo, opened in 1964, there are species that are in danger of extinction such as the jaguar and
9222-415: The North, and a number of different accreted terranes , which are mostly covered by Cenozoic volcanism. The northern extent of the Sierra Madre is the Cortés Terrane, although the northern extreme of this contains a small portion of the Carborca Terrane. Some of the northern end may also be underlain by a Precambrian basement placed around the same time as the Grenville Orogeny . Some of this area has
9381-657: The Pacific. In addition to gold and silver and their related deposits, tin , iron , and mercury occur, sometimes in later units, mostly in later volcanics, and Molybdenum occurs in the mountains, often along with older copper deposits or in Oligocene deposits in the east. The belt of tin deposits lies mostly within the eastern slopes from Durango to Guanajuato. In these areas, tin occurs in rhyolitic ignimbrites in many, possibly over 1000, small deposits of cassiterite . Typically these deposits are divided from overlying ignimbrites by breccia, which may also contain ore. Many of these are thought to be hydrothermal deposits To
9540-412: The Palaces"), a nickname attributed to Baron Alexander von Humboldt when visiting the city in the 19th century, who, sending a letter back to Germany, said Mexico City could rival any major city in Europe. But it was English politician Charles Latrobe who really penned the following: "... look at their works: the moles, aqueducts, churches, roads—and the luxurious City of Palaces which has risen from
9699-481: The Philippines arrived here before the rise of the port of Acapulco . Today, the town still boasts colonial architecture from its heyday, such as the aduana (customs office), the contaduría (accounting offices) and the fortress that protected the port against pirates. In Nayarit, the struggle for independence from Spain was initiated by the priest José María Mercado, who conquered Tepic and San Blas before being defeated and executed by Spanish royalists. In 1824, in
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#17327652459649858-427: The Sierra Madre Occidental include tufted jay , the "gray-eared" subspecies of red warbler , eared quetzal , thick-billed parrot , and formerly included the imperial woodpecker , which now may be extinct. The rivers and streams of the range contain some of the southernmost trout populations in North America. These populations may be native, although this is not universally accepted. Invasive fish compete with
10017-405: The Sierra Madre ends. Because of the monsoon, the summer accounts for the majority of rainfall in the area. The spring and fall dry season separate out a weaker wet season in the winter. In addition to increasing in the southern ranges of the mountains, rainfall increases in the higher elevations of the Sierra Madre Occidental. Humidity in the mountains varies at wide levels as does rainfall. In
10176-399: The Sierra Madre from the central Mexican Plateau . The more southern one is the north–south Aguascalientes fault extending 150 kilometres (93 mi) from Altos de Jalisco to near Zacatecas, where it joins the more northern northwest–southeast trending San Luis–Tepehuanes fault extending from Guanajuato to Durango. The southern boundary of the Sierra Madre Occidental with the Jalisco block is
10335-666: The Sierra. Its wildlife includes hundreds of bird species, both resident and breeding/migratory populations, including parrots, like the lilac-crowned amazon ( Amazona finschi ) and numerous hummingbirds, such as the Mexican woodnymph ( Thalurania ridgwayi ). There are also 119 registered species of mammals, including white-tailed deer ( Odocoileus virginianus ), collared peccary ( Dicotyles tajacu ), brocket deer ( Mazama americana ), several types of armadillo , coyote , wild felines such as puma ( Felis concolor ), jaguarundi ( Puma yagouarundi ), bobcat or lince rojo , ocelot ( Felis pardalis ) and many more species. Historically,
10494-413: The Southern Cordilleran Basaltic Andesite Suite. The tuffs are above a thick formation of lava rock. Around five or six units have been identified, mostly around the Copper Canyon area. These tuffs have allowed wide-ranging correlation with formations in other geographical areas, for example Death Valley . During the Miocene, three periods of volcanism marked separate events in the Sierras. Each period
10653-421: The Spanish preserved Tenochtitlan's basic layout, they built Catholic churches over the old Aztec temples and claimed the imperial palaces for themselves. Tenochtitlan was renamed "Mexico" because the Spanish found the word easier to pronounce. The city had been the capital of the Aztec Empire and in the colonial era, Mexico City became the capital of New Spain . The viceroy of Mexico or vice-king lived in
10812-403: The activity of magmatism in the area, forming the first major igneous series in the area. The igneous series are made up of formations of plutonic and volcanic rock, which would later be exposed. Interbedded with these rocks are sedimentary deposit rocks. In the center of the range, some of these rocks have been deformed by tectonic forcing that occurred at the same time. The southern part of
10971-469: The air is relatively drier, the driest month being December. This season is subdivided into a cold winter period and a warm spring period. The cold period spans from November to February, when polar air masses push down from the north and keep the air fairly dry. The warm period extends from March to May when subtropical winds again dominate but do not yet carry enough moisture for rain to form. Sierra Madre Occidental The Sierra Madre Occidental
11130-490: The animal may have been extirpated; the black bear population is small, and the Mexican grizzly bear that once resided here is confirmed extinct. Jaguars and ocelots are also now rare. On the other hand, mountain lion and bobcat are more common. On the eastern slopes there are American badger , coyote and gray fox that live across the mountains. Native ungulates include the white tailed deer , mule deer , and collared peccary . Rodents and lagomorphs include
11289-437: The area and surroundings. The Tarahumara frog lives in the oak and pine stands preferring moving water to pools. The southern extent of the Sonoran mountain kingsnake 's range is the Chihuahuan desert into the mountains. Other snakes and frogs live in the mountains, and many species live in the western slopes. Birds frequent the mountains, some as a migratory path and others as native species . The migratory birds often use
11448-479: The area closest to the main square in what was known as the traza , in orderly, well laid-out streets. Indigenous residences were outside that exclusive zone and houses were haphazardly located. Spaniards sought to keep indigenous people separate but since the Zócalo was a center of commerce for Amerindians, they were a constant presence in the central area, so strict segregation was never enforced. At intervals Zócalo
11607-450: The area have deposited ore veins that are commercially viable. The landscape was shaped after rock placement. Rivers cut valleys into the plateau, following folds in the rocks. Rocks have broken off of the slopes, forming rocky sides. The bedrock is covered by the clay rich soils, except in eroded areas, where water carries away deposits leaving a stony surface. The basement is thought to be Older North American basement, especially in
11766-442: The area to the west as an overwintering area, and migrate north along the western slopes. In the northern canyons birds may be divided into different habitats , or more specifically, the different types of forest, leading to differences in range by elevation. Some of this difference by elevation may even extend the range of some species, enabling tropical species to use the mountain valleys for migration. Bird species endemic to
11925-421: The area typically have large responses to the change in climate with each season. Monsoon season is the largest of these effects, with leaf buds following only a few months after the rains begin. Flowering season occurs in the months preceding the summer monsoon. This is only the peak flowering season, with plants flowering throughout the year. Due to the early flowering, fruit is ripe and seeds are dispersed at
12084-446: The area was struck by the 1985 Mexico City earthquake . The earthquake proved to be a disaster politically for the one-party state government. The Mexican government was paralyzed by its own bureaucracy and corruption, forcing ordinary citizens to create and direct their own rescue efforts and to reconstruct much of the housing that was lost as well. However, the last straw may have been the controversial elections of 1988. That year,
12243-422: The area, by combining species from different regions. Animals typically associated with arid and mountainous habitats share the mountains with species associated with habitats further south. There are many carnivorous and omnivorous mammals native to the area, although several are extirpated or are part of threatened populations. The Mexican wolf 's range in the mountains is limited to the foothills of Durango or
12402-451: The armies of Pancho Villa and Emiliano Zapata , but the city did not experience violence. Huerta had abandoned the capital and the conquering armies marched in. Venustiano Carranza 's Constitutionalist faction ultimately prevailed in the revolutionary civil war and Carranza took up residence in the presidential palace. In the 20th century the phenomenal growth of the city and its environmental and political consequences dominate. In 1900,
12561-568: The army stronghold of the ciudadela or citadel, with significant civilian casualties and the undermining of confidence in the Madero government. Victoriano Huerta , chief general of the Federal Army , saw a chance to take power, forcing Madero and Pino Suarez to sign resignations. The two were murdered later while on their way to Lecumberri prison . Huerta's ouster in July 1914 saw the entry of
12720-485: The attack against Chapultepec and carried the castle. Future Confederate generals George E. Pickett and James Longstreet participated in the attack. Serving in the Mexican defense were the cadets later immortalized as Los Niños Héroes (the "Boy Heroes"). The Mexican forces fell back from Chapultepec and retreated within the city. Attacks on the Belén and San Cosme Gates came afterwards. The treaty of Guadalupe Hidalgo
12879-400: The beginning of the rains. There are also areas where plants have little response to the seasons, particularly those areas that experience moist conditions, caused by the elevations. These plants may maintain leaves through times when other areas are in the dry season, during which most deciduous trees have no leaves. The mountains are often a corridor for species allowing more diversity in
13038-549: The border between Nayarit and the states of Jalisco and Sinaloa , respectively. Notable lagoons in Nayarit include Santa María del Oro , San Pedro Lagunillas and Agua Brava . Nayarit – as with all states of Mexico – is geographically divided into municipalities ( municipios ) , creating twenty municipalities in Nayarit : Nayarit's natural vegetation varies with altitude; coastal lowlands and river valleys were, historically, covered with tropical dry forest, containing many native deciduous trees that lost their leaves during
13197-588: The breakdown is usually at a slower pace than the movement north. This high pressure belt is associated with the mechanics that form the Bermuda High . The climate in the mountains is mild. Summer temperatures maintain a constant level. Maximum temperatures are typically in July at around 31 C with average temperatures of the order of 16 C during this same period. Mean annual temperatures are between 13–18 °C (55–65 °F) above 1,800 metres (6,000 ft). Below-freezing temperatures can occur in
13356-501: The camaraderie did not last long. Cortés put Moctezuma under house arrest , hoping to rule through him. Tensions increased until, on the night of 30 June 1520 – during a struggle known as " La Noche Triste " – the Aztecs rose up against the Spanish intrusion and managed to capture or drive out the Europeans and their Tlaxcalan allies. Cortés regrouped at Tlaxcala. The Aztecs thought the Spaniards were permanently gone, and they elected
13515-595: The canyon of the Santiago River. Near these sediments late Oligocene to early Miocene granite and granodiorite intrusive bodies occur. A possible cause of this is that these bodies were roof pendants which were uplifted by plutons . Mesozoic limestone also occurs in northern portion of the mountains, mostly from the Cretaceous. Towards the end of the Cretaceous , the Laramide orogeny increased
13674-501: The capital. The 16th century saw a proliferation of churches, many of which can still be seen today in the historic center . Economically, Mexico City prospered as a result of trade. Unlike Brazil or Peru , Mexico had easy contact with both the Atlantic and Pacific worlds. Although the Spanish crown tried to completely regulate all commerce in the city, it had only partial success. The concept of nobility flourished in New Spain in
13833-413: The city vulnerable to flooding. Drainage was engineered through the use of canals and tunnels starting in the 17th century. Mexico City primarily rests on what was Lake Texcoco . Seismic activity is frequent there. Lake Texcoco was drained starting from the 17th century. Although none of the lake waters remain, the city rests on the lake bed's heavily saturated clay. This soft base is collapsing due to
13992-478: The clay-built ruins of Tenochtitlan...", on page 84 of the Letter V of The Rambler in Mexico . During the colonial period, the city's motto was "Muy Noble e Insigne, Muy Leal e Imperial" (Very Noble and Distinguished, Very Loyal and Imperial). During Andrés Manuel López Obrador 's administration a political slogan was introduced: la Ciudad de la Esperanza ( lit. ' The City of Hope ' ). This motto
14151-438: The colonial period to work on infrastructure to prevent flooding. Floods were not only an inconvenience but also a health hazard, since during flood periods human waste polluted the city's streets. By draining the area, the mosquito population dropped as did the frequency of the diseases they spread. However, draining the wetlands also changed the habitat for fish and birds and the areas accessible for indigenous cultivation close to
14310-506: The construction of large sporting facilities. In 1969, the Mexico City Metro was inaugurated. Explosive growth in the population of the city started in the 1960s, with the population overflowing the boundaries of the Federal District into the neighboring State of Mexico, especially to the north, northwest, and northeast. Between 1960 and 1980 the city's population more than doubled to nearly 9 million. In 1980, half of all
14469-409: The cultures were descended from these original Aztatlán settlements and other Classic-stage cultures who had merged with them. Hernán Cortés was the first known European to enter into the area now known as Nayarit, which he claimed for Spain as part of Nueva Galicia . Under Nuño de Guzmán , Spaniards took the region with considerable brutality, causing the indigenous inhabitants to revolt, in what
14628-429: The draining of Lake Texcoco and global warming have greatly reduced snowfalls after the snow flurries of 12 February 1907. Since 1908, snow has only fallen three times, snow on 14 February 1920; snow flurries on 14 March 1940; and on 12 January 1967, when 8 centimeters (3 in) of snow fell on the city, the most on record. The 1967 snowstorm coincided with the operation of Deep Drainage System that resulted in
14787-623: The dry seasons. The Sinaloan dry forests now cover the northern coastal lowlands, and extend up the valleys of the San Pedro Mezquital River and the Río Grande de Santiago and its tributaries. The Jalisco dry forests ecoregion covers coastal Nayarit south of San Blas and the Islas Marías. The Marismas Nacionales–San Blas mangroves , a network of coastal Pacific lagoons and tidal mangrove forests, extend along
14946-643: The early flows. Fissure-vein deposits have been divided into two groups of fissure vein deposits, which are divided geographically into an eastern and western series. In the east, the gold and silver are accompanied by lead and zinc . In the south, the Bolaños mine district is contained with the Bolaños Graben. Some also occur as epithermal deposits. Also, some gold occurs along with copper in Cenozoic iron-oxide skarn and replacement deposits along
15105-460: The early morning before dawn, the air is almost saturated (often over 90% relative humidity ) near the mountain tops with low clouds over the range. Lower in the range, air is not as near saturated in the morning. Seasonal variation in humidity is also present with average May and June relative humidity around 50%, with 25% possible during the day. Also during the day, relative humidity drops and cloud levels rise as temperatures rise. The humidity of
15264-566: The east of these units is a belt of more mercury deposits, followed by another belt of manganese deposits, although these deposits are mostly limited to Chihuahua and Hidalgo. Iron occurs in three different regions placed by different mechanisms. Along the Pacific there the numerous skarn and replacement deposits mentioned above with relation to gold. Iron occurs in Durango in the form of magnetite lava flows, which are often surrounded by smaller hematite deposits, thought to be ash flows. There
15423-404: The eastern slopes have increased organic content and a clay heavy layer that is developed more than those of the more arid eastern lands. The thickness of soil layers also increases. Problems with soil degradation have been aggravated by the cultivation of drug crops, leading to deforestation of many areas. Other problems include overgrazing , which has led to terracing from cattle paths and
15582-498: The final siege of the conquest. Cortés first settled in Coyoacán , but decided to rebuild the Aztec site to erase all traces of the old order. He did not establish a territory under his own personal rule , but remained loyal to the Spanish crown. The first Spanish viceroy arrived in Mexico City fourteen years later. By that time, the city had again become a city-state , having power that extended far beyond its borders. Although
15741-477: The first constitution of the Mexican Republic, Nayarit was a part of Jalisco . In the mid-1800s Comanche Indians, from Texas and Oklahoma, attacked Tepic causing widespread destruction. During the second half of the 19th century, Nayarit was one of the most turbulent territories in Mexico. The population was in open revolt, demanding access to land. Nayarit was one of the last territories admitted as
15900-497: The fishing industry alone in Nayarit. Much of the food produced in Nayarit is exported to the larger urban areas surrounding Mexico City and Guadalajara, and much of the agricultural labor is performed by migrant laborers . Although mining exists in Nayarit, it is mostly of non- metallic substances such as limestone or kaolin . Beginning in the late 90's, Nayarit has become known as a producer of specialty Arabica coffee , regarded for its fine taste and high density beans grown in
16059-422: The formation of a soil crust , and soil acidification , which poses a risk to some grasslands as of 2002. The climate varies considerably between the northern and southern extents of this long mountain range. Seasonal variations also occur due to the presence of large bodies of warm water delivering warm damp air from each side of the range. This region undergoes a seasonal variety with two wet seasons, including
16218-439: The growth in the tourism industry might have harmful impacts on the community. Timeshare scams with links to the local Nayarit Mafia are quite common. Newspapers of Nayarit include: El Periódico en que Nayarit Opina Día a Día , El Semanario que refleja qué hay en Nayarit , Matutino Gráfico , Meridiano de Nayarit , and Realidades. Mexico City Mexico City is the capital and largest city of Mexico , and
16377-609: The height of the mountain start around 3,040 m (9,970 ft) and go up to 3,300 m (10,800 ft). However, Cerro Barajas, at 26°24′N 106°5′W / 26.400°N 106.083°W / 26.400; -106.083 , may be as high as 3,300 m (10,800 ft) although other sources give 3,170 m (10,400 ft) as the elevation. Cerro Gordo, at 23°12′N 104°57′W / 23.200°N 104.950°W / 23.200; -104.950 , may have an elevation between 3,350 m (10,990 ft) and 3,340 m (10,960 ft). The southern end of
16536-420: The higher mountains, with precipitation occurring as snowfall certain times of year. During the summer monsoon, wind patterns undergo large-scale changes. In May there is very little large-scale wind current through the mountains, most circulates around the mountains, although onshore flow is present. As the high pressure moves north, air is pulled off the Gulf of Mexico, bringing easterly winds aloft to
16695-581: The highest temperature on record was 34.7 °C (94.5 °F) on 25 May 2024. Overall precipitation is heavily concentrated in the summer months, and includes dense hail . Snow falls in the city scarcely, although somewhat more often on nearby mountaintops. Throughout its history, the Central Valley of Mexico was accustomed to having several snowfalls per decade (including a period between 1878 and 1895 in which every single year—except 1880—recorded snowfalls ), mostly lake-effect snow . The effects of
16854-610: The industrial jobs in Mexico were located in Mexico City. Under relentless growth, the Mexico City government could barely keep up with services. Villagers from the countryside who continued to pour into the city to escape poverty only compounded the city's problems. With no housing available, they took over lands surrounding the city, creating huge shanty towns . The inhabitants of Mexico City faced serious air pollution and water pollution problems, as well as groundwater-related subsidence . Air and water pollution has been contained and improved in several areas due to government programs,
17013-655: The insurgency, occurred four days later. After a decade of war, Mexico's independence from Spain was effectively declared in the Declaration of Independence of the Mexican Empire on 27 September 1821. Agustín de Iturbide is proclaimed Emperor of the First Mexican Empire by Congress, crowned in the Cathedral of Mexico . The Mexican Federal District was established by the new government and by
17172-465: The interior basins . These faults are commonly covered by alluvium and basalt , making them difficult to discern, but can be found in certain fault blocks . Grabens have formed in the north, and some of these are filled with volcanic and sedimentary floors, and long depressions have formed in the southern Sierra Madre. The faulting decreases in the center of the range where the faults are mostly small normal faults , but increases once again on
17331-517: The largest Spanish-speaking city (city proper) in the world. Greater Mexico City has a GDP of $ 411 billion in 2011, which makes it one of the most productive urban areas in the world . The city was responsible for generating 15.8% of Mexico's GDP, and the metropolitan area accounted for about 22% of the country's GDP. If it were an independent country in 2013, Mexico City would be the fifth-largest economy in Latin America . Mexico City
17490-465: The last half of the 18th century. Many of these palaces can still be seen today, leading to Mexico City's nickname of "The city of palaces" given by Alexander Von Humboldt . The Grito de Dolores ("Cry of Dolores"), also known as El Grito de la Independencia ("Cry of Independence"), marked the beginning of the Mexican War of Independence . The Battle of Guanajuato, the first major engagement of
17649-452: The levels of these two pollutants reached critical levels, contingency actions were implemented which included closing factories, changing school hours, and extending the A day without a car program to two days of the week. The government also instituted industrial technology improvements, a strict biannual vehicle emission inspection and the reformulation of gasoline and diesel fuels . The introduction of Metrobús bus rapid transit and
17808-564: The lower Cenolithic period (9500–7000 BC). However, a 2003 study placed the age of the Peñon woman at 12,700 years old (calendar age), one of the oldest human remains discovered in the Americas. Studies of her mitochondrial DNA suggest she was either of Asian or European or Aboriginal Australian origin. The area was the destination of the migrations of the Teochichimecas during the 8th and 13th centuries, people that would give rise to
17967-489: The main campus of the National Autonomous University of Mexico . Designed by the most prestigious architects of the era, including Mario Pani , Eugenio Peschard , and Enrique del Moral , the buildings feature murals by artists Diego Rivera , David Alfaro Siqueiros , and José Chávez Morado . It has since been recognized as a UNESCO World Heritage Site . The 1968 Olympic Games brought about
18126-424: The metropolitan area. The area receives about 820 millimeters (32 in) of annual rainfall, which is concentrated from May through October with little or no precipitation for the remainder of the year. The area has two main seasons. The wet humid summer runs from May to October when winds bring in tropical moisture from the sea, the wettest month being July. The cool sunny winter runs from November to April, when
18285-562: The middle, an arc of andesite was placed during the spreading of the Gulf of California . The basin and range-style faulting of the middle-late Miocene took place at the same time as the placement of alkali basalts , In the westernmost slopes mafic dikes formed. These events have also been linked to the subduction of the Farallon Plate . Episodes of volcanism continued into the Quaternary . The Sierras are believed to be
18444-539: The monsoon season. Precipitation varies on both annual and seasonal scales in the Sierra Madre. Annual differences in regional climate are associated with the El Niño-Southern Oscillation with El Niño years leading to a wetter climate. Monsoon rains come to the Sierra Madre in June as the high pressure area moves north, leading to wet summer seasons. This causes east winds bringing moisture from
18603-501: The mountains extending from Alaska down to these across western North America. Sierra Tarahumara or Tarahumara is the name for the region of the Sierra Madre beginning at the Durango border and extending north. This name comes from the Tarahumara natives. This is a dramatic landscape of steep mountains formed by a high plateau that has been cut through with canyons including Copper Canyon , larger and, in places, deeper than
18762-652: The mountains may be referred to as the Sierra Huichola. In this area, the Sierra Madre begins to give way to the Basin and Range Province . Subranges of this area include the Sierra de Alica and the Sierra Pajaritos , both in Nayarit, and the Sierra los Huicholes , Sierra de Morones , Sierra Nochistlán, and Sierra Fría extending eastwards into Jalisco, Zacatecas, and Aguascalientes. The mountains act as
18921-417: The mountains. On the east slope of the mountain, daytime upslope winds flow to the crest, where the flow joins westerly winds. The mountains cause convection during the following monsoon season, during which nocturnal winds at low levels in the atmosphere move moisture overnight. Extensive lightning activity occurs during this season. After the high pressure breaks down, wind patterns return to those prior to
19080-634: The native population's opposition to these practices. The range trends from the north to southeast. Canyons cut by the rivers of the wet western slopes exist in addition to those of the northeast slopes, notably the Copper Canyon . The range runs parallel to the Pacific coast of Mexico, from just south of the Arizona-Sonora border southeast through eastern Sonora , western Chihuahua , Sinaloa , Durango , Zacatecas , Nayarit , Jalisco , Aguascalientes to Guanajuato , where it joins with
19239-539: The native species which has been a cause of concern among researchers, along with concerns about the effects of logging on these species. The Sonoran Desert is found in the northwestern foothills at 1,000–2,000 m (3,300–6,600 ft). The Chihuahuan Desert is found to the northeast and east, the Meseta Central matorral and Central Mexican matorral to the southeast, and the Sinaloan dry forests to
19398-490: The north, Zacatecas to the northeast and Jalisco to the south. To the west, Nayarit has a significant share of coastline on the Pacific Ocean , including the islands of Marías and Marietas . The beaches of San Blas and the so-called " Riviera Nayarit " are popular with tourists and snowbirds . Besides tourism, the economy of the state is based mainly on agriculture and fishing. It is also one of two states where
19557-533: The northeast are broad, tropical plains watered by the Río Grande de Santiago , a continuation of the Lerma River . The main state rivers are the Río Grande de Santiago , San Pedro Mezquital , Acaponeta , Ameca , and Las Cañas . The Río Grande de Santiago is the largest river in Nayarit. The Santiago and its tributaries are of major importance for agricultural irrigation. The Ameca and the Las Cañas lie on
19716-455: The old Aztec ceremonial center. The existing central plaza of the Aztecs was effectively and permanently transformed to the ceremonial center and seat of power during the colonial period, and remains to this day in modern Mexico, the central plaza of the nation. The rebuilding of the city after the siege of Tenochtitlan was accomplished by the abundant indigenous labor in the surrounding area. Franciscan friar Toribio de Benavente Motolinia , one of
19875-419: The over-extraction of groundwater, called groundwater-related subsidence . Since the beginning of the 20th century the city has sunk as much as nine meters (30 feet) in some areas. On average Mexico City sinks 20 inches (1 foot and 8 inches) or 50 centimetres (1/2 meters ) every year. This sinking is causing problems with runoff and wastewater management, leading to flooding problems, especially during
20034-650: The pine forests of the Desierto de los Leones National Park . Amusement parks include Six Flags México , in Ajusco neighborhood which is the largest in Latin America. There are numerous seasonal fairs present in the city. Mexico City has three zoos. Chapultepec Zoo , the San Juan de Aragon Zoo [ es ; no ] and Los Coyotes Zoo . Chapultepec Zoo is located in the first section of Chapultepec Park in
20193-516: The political disputes of the country. It was the imperial capital on two occasions (1821–1823 and 1864–1867), and of two federalist states and two centralist states that followed innumerable coups d'états in the space of half a century before the triumph of the Liberals after the Reform War . It was also the objective of one of the two French invasions to Mexico ( 1861–1867 ), and occupied for
20352-568: The population of Mexico City was about 500,000. The city began to grow rapidly westward in the early part of the 20th century and then began to grow upwards in the 1950s, with the Torre Latinoamericana becoming the city's first skyscraper. The rapid development of Mexico City as a center for modernist architecture was most fully manifested in the mid-1950s construction of the Ciudad Universitaria, Mexico City ,
20511-636: The postal abbreviation of the Federal District in Spanish: D.F., which is read "De-Efe"). They are formally called capitalinos (in reference to the city being the capital of the country), but "[p]erhaps because capitalino is the more polite, specific, and correct word, it is almost never utilized". The oldest signs of human occupation in the area of Mexico City are those of the " Peñón woman " and others found in San Bartolo Atepehuacan ( Gustavo A. Madero ). They were believed to correspond to
20670-432: The presidency was set between the P.R.I. 's candidate, Carlos Salinas de Gortari, and a coalition of left-wing parties led by Cuauhtémoc Cárdenas , son of the former president Lázaro Cárdenas . The counting system "fell" because coincidentally the power went out and suddenly, when it returned, the winning candidate was Salinas, even though Cárdenas had the upper hand. As a result of the fraudulent election, Cárdenas became
20829-558: The rain forest and wildlife of Nayarit is an issue of crucial importance. The Islas Marías were designated as the Islas Marías Biosphere Reserve by UNESCO in 2010. Nayarit is Mexico's twenty-ninth most populous state. According to the census of 2020, the state had a population of 1,235,456 and its population density was 39/km. Nayarit is the home to four indigenous groups: the Wixaritari (Huichol),
20988-401: The range are the major determining factors in the dominant plants. Oaks dominate the lower reaches of the mountains, where stands grow down to about 1,000 m (3,300 ft). Some oak species even continue into the surrounding ecosystems. In the western slopes of the range, cloud forest also occurs, mostly on mid-elevation slopes with little exposure to wind or sun in the southern end of
21147-519: The range contains none of the volcanism that is apparent in the northern range. These formations ended in the Paleocene . Eocene volcanism formed a series of andesitic and rhyolitic formations in the area, with spatial and temporal variations throughout. Most of the gold and silver deposits are also in these rocks. In the Oligocene, ash flows became the predominant deposit of the area, with interbedded lava flows between. These ash flows began
21306-476: The range is also influenced by the same seasonal changes as rainfall. In the dry season dew points are low at high elevations (500 hPa), around −22 °C (−8 °F) in the south of the range, and −24 and −26 °C (−11 and −15 °F) in the north in May. In June, dew points begin to increase from the May levels up to −20 °C (−4 °F) in the north and −16 °C (3 °F) in the south. By July these dew points are at −14 °C (7 °F) throughout
21465-424: The range, but the forests in the mountains vary by elevation and place in the range. This ecoregion is noted for its high biodiversity and large number of endemic species, and for allowing some species to extend their range . The dominant plants vary across the range, and the habitat that they present varies from scattered woodland to both deciduous and coniferous forest. The elevation and latitude in
21624-442: The range. At higher elevations pines begin to grow alongside the oaks, and pines begin to dominate the oaks at higher elevations. At high elevations and in the north, mixed conifer forests become the dominant ecosystem. These forests are composed primarily of pines and firs , which begin to grow at these elevations. There are also grasslands on some mountain tops, surrounded by the forest that occur in those areas. Plants in
21783-405: The range. The range allows higher dew points throughout these periods than the surrounding low lands. This rise in humidity accompanies the monsoon. The mountains create a diverse setting for plants and animals by creating a different set of conditions from the surroundings. The Sierra Madre Occidental pine-oak forests are found at elevations of 1,500–3,000 m (4,900–9,800 ft) throughout
21942-472: The renovation of vehicles and the modernization of public transportation. The autocratic government that ruled Mexico City since the Revolution was tolerated, mostly because of the continued economic expansion since World War II. This was the case even though this government could not handle the population and pollution problems adequately. Nevertheless, discontent and protests began in the 1960s leading to
22101-593: The right to elect both a head of government and the representatives of the unicameral Legislative Assembly by election in 1997. Ever since, left-wing parties (first the Party of the Democratic Revolution and later the National Regeneration Movement ) have controlled both of them. The city has several progressive policies, such as elective abortions , a limited form of euthanasia , no-fault divorce , same-sex marriage , and legal gender change . On 29 January 2016, it ceased to be
22260-415: The rock that is most visible to be ignimbrites with lava flow layers. The region has a general strike from just west of north to just south of east. Faults in the area tend to be younger than the upper volcanics, excluding those associated with calderas, but do occur in distinct periods. The large faults along the eastern slope have caused the slope to be made up of large escarpments that face into
22419-435: The second series of high magmatism formations. The Mid-Tertiary ignimbrite flare-up formed a series of ignimbrite formations, layered one atop another, that are sometimes broken by lava flows. The ignimbrite formations in this area cover the largest area of any known series, with ten calderas identified in the province. Three of these calderas are in Copper Canyon. The lava has formed a series of mafic rocks that comprise
22578-417: The siege of Tenochtitlan, and during colonial times the Spanish regularly drained the lake to prevent floods. Only a small section of the original lake remains, located outside Mexico City, in the municipality of Atenco , State of Mexico . Architects Teodoro González de León and Alberto Kalach along with a group of Mexican urbanists, engineers and biologists have developed the project plan for Recovering
22737-595: The signing of their new constitution, where the concept of a federal district was adapted from the United States Constitution . Before this designation, Mexico City had served as the seat of government for both the State of Mexico and the nation as a whole. Texcoco de Mora and then Toluca became the capital of the State of Mexico. During the 19th century, Mexico City was the center stage of all
22896-465: The soil help reduce runoff and soil losses from erosion. Areas that are covered in stone are known as lithosols , and make up most of the remaining surface in the mountains, especially on upper slopes. The last major soil type are vertisols , which are thin mineral-poor soils. Soils at higher elevations experience more leaching , due to increased rainfall. Acidic soils may have lower calcium content, leading to lower plant soil quality . Soils along
23055-504: The state's northern coast and into adjacent Sinaloa state. The mangroves are home to abundant wildlife, including migratory and resident waterbirds. The mountains are home to pine–oak forests , which vary in density with elevation. Oak forests and woodlands tend to grow at lower elevations, interspersed with smaller areas of humid cloud forest in areas of higher rainfall. The highest elevations contain forests of conifers, pines and oak. Nayarit also contains hundreds of miles of rainforest in
23214-462: The summer. The entire lake bed is now paved over and most of the city's remaining forested areas lie in the southern boroughs of Milpa Alta , Tlalpan and Xochimilco . Originally much of the valley lay beneath the waters of Lake Texcoco , a system of interconnected salt and freshwater lakes. The Aztecs built dikes to separate the fresh water used to raise crops in chinampas and to prevent recurrent floods. These dikes were destroyed during
23373-607: The terrane is mostly covered by volcanics and sedimentary deposits, so it is only visible where erosion has revealed it. The main subterranes of the Guerrero Composite Terrane that are within the Sierra Madre are the Tahue and Zihuatanejo terranes. Dividing the Guerrero Terrane from the rest of the Sierra Madre terranes is a boundary that is thought to represent the Early Cretaceous Arperos Basin,
23532-417: The total draining of what was left of Lake Texcoco. After the disappearance of Lake Texcoco, snow has never fallen again over Mexico City. The region of the Valley of Mexico receives anti-cyclonic systems. The weak winds of these systems do not allow for the dispersion, outside the basin, of the air pollutants which are produced by the 50,000 industries and 4 million vehicles operating in and around
23691-488: The viceregal palace on the main square or Zócalo . The Mexico City Metropolitan Cathedral , the seat of the Archbishopric of New Spain, was constructed on another side of the Zócalo, as was the archbishop's palace, and across from it the building housing the city council or ayuntamiento of the city. A late seventeenth-century painting of the Zócalo by Cristóbal de Villalpando depicts the main square, which had been
23850-705: The volcanic soils of the Sierra Madre Occidental . Nayarit coffee is exported all over the world, including to the UK and Australia via the Grupo Terruño Nayarita farmers cooperative. In recent years, Nayarit has worked to build its tourism sector, marketing the " Riviera Nayarit " as a safe, beautiful destination served by Puerto Vallarta International Airport . Popular resort towns include Bucerías , Punta de Mita , La Cruz de Huanacaxtle , San Blas , Santiago Ixcuintla , Sayulita and Tecuala . However, some residents in these and other towns are concerned that
24009-614: The western boundary of the faults in the southern mountains. In the north there is an unknown boundary between the Cortes Terrane and the Guerrero Composite Terrane. Some theorize that this is a section of the Mojave–Sonora Megashear, but this theory is not universally accepted; however, the Megashear is important, and, in fact, is necessary for reconstructions of the opening of the Gulf of California, as of 2003. On
24168-410: The western slope. In fact, the major normal faults tend to diverge around the center of the core and join at either end. Some of these faults may have allowed ignimbrites to erupt from the surface, and so there may be some association between the ignimbrite occurrence and faults; this can be used to find out information about different kinds of basement rock present. There are two faults dividing
24327-423: Was built in the center of the inland lake system, with the city reachable by canoe and by wide causeways to the mainland. The causeways were rebuilt under Spanish rule with indigenous labor. Colonial Spanish cities were constructed on a grid pattern, if no geographical obstacle prevented it. In Mexico City, the Zócalo (main square) was the central place from which the grid was then built outward. The Spanish lived in
24486-424: Was established, known as México Tenochtitlán , and as of 1585, it was officially known as Ciudad de México (Mexico City). Mexico City played a major role in the Spanish colonial empire as a political, administrative, and financial center. Following independence from Spain , the federal district was established in 1824. After years of demanding greater political autonomy , residents were finally given
24645-557: Was later referred to as the Mixtón War . After almost two centuries of resistance, the last independent Cora communities were incorporated into Spanish administration by force in 1722. Then followed intense missionary efforts by Jesuits to convert the indigenous. In the colonial period, the port of San Blas was one of the most important trade ports on the American Pacific coast. Galleons transporting goods from Manila,
24804-418: Was not political but rather a very conservative Spanish social one, based on proving the worthiness of the family. Most of these families proved their worth by making fortunes in New Spain outside of the city itself, then spending the revenues in the capital, building churches, supporting charities and building extravagant palatial homes. The craze to build the most opulent residence possible reached its height in
24963-554: Was quickly adopted as a city nickname but has faded since the new motto, Capital en Movimiento ("Capital in Movement"), was adopted by the administration headed by Marcelo Ebrard , though the latter is not treated as often as a nickname in media. Up until 2013, it was common to refer to the city by the initialism "DF" from "Distrito Federal de México". Since 2013, the abbreviation "CDMX" (Ciudad de México) has been more common, particularly in relation to government campaigns. The city
25122-566: Was signed in what is now the far north of the city. The capital escaped the worst of the violence of the ten-year conflict of the Mexican Revolution . The most significant episode of this period for the city was the Decena Trágica ("Ten Tragic Days") of February 1913, when forces counter to the elected government of Francisco I. Madero staged a successful coup. The center of the city was subjected to artillery attacks from
25281-403: Was where major celebrations took place as well as executions. It was also the site of two major riots in the seventeenth century, one in 1624, the other in 1692. The city grew as the population did, coming up against the lake's waters. As the depth of the lake water fluctuated, Mexico City was subject to periodic flooding. A major labor draft, the desagüe , compelled thousands of indigenous over
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