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33-608: [REDACTED] Look up entrada in Wiktionary, the free dictionary. Entrada is a Spanish or Portuguese word meaning entry and may refer to: Entrada Sandstone , a geological formation spread across Wyoming, Colorado, New Mexico, Arizona and Utah Entradas , a town in Castro Verde, Portugal La Entrada , a town in Honduras La Entrada al Pacífico ,

66-634: A drilling spike during the 1980s and 1990s. Production has since leveled out, but the basin is still actively producing today. While the majority of production has occurred in Cretaceous-aged units, the Paleozoic rocks of the Four Corners Platform have successfully produced from over two-dozen fields from Devonian, Mississippian, and Pennsylvanian-aged units. The Paleozoic units deepen in a northeast direction where they cross from

99-506: A time of terrestrial deposits, including late-Permian eolian deposits. The Cretaceous was a time of three major transgressive-regressive cycles, as eustatic changes in sea-level caused fluctuations on the Western Interior Seaway's shoreline. The San Juan Basin was conveniently located in the western margin of the seaway and recorded these cycles in the stratigraphy (see Stratigraphy below). The westernmost extent of

132-470: A trade corridor between Mexico and the United States "Entrada" ( Fringe ) , an episode of the television series Fringe Entrada Travel Group , New Zealand travel company Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Entrada . If an internal link led you here, you may wish to change the link to point directly to

165-432: Is 113 meters (371 ft) of orange-red silty sandstone, with occasional beds of red mudstone, corresponding to the earthy facies. The middle member is 132 meters (433 ft) of red to green mudstone interbedded with red to white sandstone. The upper member is 69 meters (226 ft) of crossbedded white sandstone. The white color is attributed to bleaching by organic-rich fluids from overlying beds. The formation rests on

198-912: Is bound on the northwest by the Hogback Monocline (separating the Central Basin and Four Corners platforms), on the northeast by the Archuleta Anticlinorium, on the east by the Nacimiento Uplift, and on the south by the Zuni Uplift. Prior to collision , Mississippian- and Pennsylvanian-aged units were deposited during various marine environments, e.g. the Leadville Limestone and the Pinkerton Trail Formations. Once

231-795: Is overlain by the Todilto Formation . Southeast of Fort Defiance, Arizona , the lower sandy beds are assigned to the Iyanbito Member. Total thickness is up to 37 meters (121 ft). In the Slick Rock, Colorado area, the Entrada is divided into a "middle sandstone", the Rehoboth Member, and the Slick Rock Member, in ascending order. The Entrada has been dated to the early to middle Callovian stage of

264-587: The Continental Divide , and its main drainage is the southwest- to west-flowing San Juan River , which eventually joins the Colorado River in Utah. Climate of the basin is arid to semiarid , with an annual precipitation of 15 in (380 mm) and an average annual temperature of around 50 °F (10 °C). The San Juan Basin has been a major producer of oil and natural gas since

297-713: The Kirtland Shale) . Eocene / Oligocene volcanism resulted in large volcanic aprons that covered thousands of square-kilometers, and these volcanic fields sourced the Cenozoic units the Ojo Alamo (sourced from the west), and the Animas and Nacimiento formations (sourced from the northeast). Uplift in the northwest (and subsequent erosion), and continued deposition (e.g. the San Jose Formation ) brought

330-606: The supercontinents collided (see Tectonic Evolution above), the subsidence of the Paradox Basin and the uplift of the Uncompahgre highlands allowed for enormous amounts of sediment to shed off the highlands via Permian fluvial systems. The Rico Formation represents the transition from Pennsylvanian marine deposits to Permian terrestrial deposits of the Cutler Formation . The Permian continued to be

363-567: The "slickrock facies". This is actually more typical of the Entrada as a whole, and a principal reference section including both facies was designated by Peterson in 1988 at Pine Creek, 5 kilometers (3.1 mi) north of Escalante, Utah , in the Kaiparowits Basin . At the reference section in the Kaiparowitz Basin, the Entrada is 314 meters (1,030 ft) thick and is divided into three informal members. The lower member

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396-526: The Basin. The discovery was based on data from the European Space Agency ’s Scanning Imaging Absorption Spectrometer for Atmospheric Chartography instrument from 2002 to 2012. The report concluded that "the source is likely from established gas, coal, and coalbed methane mining and processing." The region emitted 590,000 metric tons of methane every year between 2002 and 2012—almost 3.5 times

429-763: The Carmel Formation and is overlain by the Morrison Formation . In the Curtis Mountains region of northeastern Arizona, the Entrada is overlain by the Wanakah Formation . In the San Juan Basin of northwestern New Mexico , the Entrada consists of upper and lower sandy members and a medial silty member, the Rehoboth Member. The Curtis Formation is sometimes absent and the Entrada then overlies Chinle Formation . It

462-539: The Central Basin Platform. The well was 300 m deep and resulted in a gas pipeline to carry and market gas to nearby cities. The following years resulted in many oil and gas discoveries that subsequently spiked interest in San Juan resources. The 1930s brought upon the first pipeline to transport gas outside of the basin. The 1980s brought upon the discovery of the coal-bed methane resources, resulting in

495-816: The basin occupies space in the San Juan , Rio Arriba , Sandoval , and McKinley counties in New Mexico, and La Plata and Archuleta counties in Colorado. The basin extends roughly 100 miles (160 km) N-S and 90 miles (140 km) E-W. The San Juan Basin is an asymmetric structural depression in the Colorado Plateau province, with varying elevation and nearly 3,000 feet (910 m) in topographic relief. Its most striking features include Chaco Canyon (northwestern New Mexico, between Farmington and Santa Fe ) and Chacra Mesa . The basin lies west of

528-617: The basin to its current-day configuration. Little is known about Precambrian units due to poor outcrop exposure and poor well-control. Precambrian rocks consist of quartzite , schist , and granite , and rocks are overlain unconformably by younger Paleozoic units. Little is known about the stratigraphy of the Paleozoic. Of the >40,000 wells drilled in the San Juan Basin, only about 12 have penetrated deep enough to come in contact with Paleozoic units. Additionally, poor outcrop exposure and lateral facies changes complicate

561-529: The center of the continent. During late Cretaceous to early Tertiary , compressional forces (continued subduction of the Farallon Plate) continued to act and caused the uplift of the modern Rocky Mountains via the Laramide Orogeny . Early-Tertiary tilting towards the northwest resulted in over 2,000 feet (610 m) of erosion in the southeast. As compression shifted to extension and

594-619: The defining and correlation of these units. The Cretaceous-aged units are the most well-understood and the most productive units in the San Juan Basin. The Inner Cretaceous Seaway's western extent was along the San Juan Basin, and the three major transgressive-regressive episodes that occurred during this time are recorded in the mid- to upper-Cretaceous stratigraphy. The San Juan Basin contains ample fuel resources, including oil, gas, coal, and uranium. The basin has produced from over 300 oil fields and nearly 40,000 wells, most of which are sourced from Cretaceous-aged rocks. Furthermore, 90% of

627-435: The early 20th century, with currently more than 300 oil fields and over 40,000 drilled wells throughout the area. As of 2009, cumulative production reached 42.6 trillion cubic feet of gas and 381 million barrels of oil. The area is especially known for gas reservoirs from its coal-bed methane formations. The San Juan Basin contains the largest coal-bed methane field in the world and ranks second in total gas reserves. During

660-661: The formation of the Rio Grande Rift began, volcanism dominated the area throughout much of the Eocene and Oligocene . Uplift in the northwest and continued deposition brought the basin to its current-day configuration. The San Juan Basin is an asymmetrical syncline with three components: the Central Basin Platform, the Four Corners Platform, and the Chaco Slope (a.k.a. the Chaco Homocline ). The basin

693-764: The formation was written in 1988 by Peterson. Entrada members are (in alphabetical order): Entrada Sandstone is found in these geologic locations: Geologic province : Found in these parklands (incomplete list): Spatial distribution: San Juan Basin The San Juan Basin is a geologic structural basin located near the Four Corners region of the Southwestern United States . The basin covers 7,500 square miles and resides in northwestern New Mexico , southwestern Colorado , and parts of Utah and Arizona . Specifically,

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726-543: The giant landmass of Pangea . This continental collision resulted in several pivotal orogenic (mountain building) episodes. The collision of supercontinents Gondwana and Laurentia resulted in the Alleghanian and Ouachita orogenies. The Alleghanian Orogeny was the collision of Africa with the current-day southeastern United States, and resulted in the Appalachian Mountains . The Ouachita Orogeny

759-428: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Entrada&oldid=1242841121 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Entrada Sandstone At its type section at Entrada Point , located in

792-615: The latest Middle Jurassic . The Entrada Sandstone was named as one of the four formations of the San Rafael Group by James Gilluly and Reeside in 1928. Gregory and Moore worked out the geographic extent of the formation and gave an overview of it in 1931. The extent was revised several times afterwards (most recently in 1992 by Condon). It was divided into the Gunsight Butte, Cannonville, and Escalante members by Thompson and Stokes in 1970. The principal reference for

825-685: The majority of gas and oil production in the San Juan Basin, i.e. nearly 250 of the >300 fields source Upper Cretaceous units. Major oil plays in the San Juan Basin target the Dakota Sandstone, the Gallup Sandstone, the Tocito Sandstone, and the El Vado Sandstone Member. The source rock for these units was the black, organic-rich marine shale of the stratigraphically lower Mancos Formation . Most of

858-407: The mid- Paleozoic , the San Juan Basin was part of the ancient landmass called Laurentia ; this was a supercontinent that contained much of current-day North America . The ancient landmass called Gondwana contained most of the southern continents, e.g. South America and Africa . During the late- Mississippian (~320 million years ago), the landmasses of Laurentia and Gondwana collided to form

891-728: The northern part the San Rafael Swell in Emery County, Utah , the Entrada consists of red silty sandstone and lesser interbedded mudstone and is a slope-forming formation. This part of the Entrada is sometimes described as the "earthy facies ". Here the Entrada is overlain by the Curtis Formation , and overlies the Carmel Formation . To the south and east, the Entrada transitions to cliff-forming red or white crossbedded sandstone, sometimes called

924-557: The oil fields described below are at or nearing depletion. Major gas plays in the San Juan Basin target the Dakota Sandstone, the Point Lookout Sandstone, and the Pictured Cliffs Sandstone. Plays consist of stratigraphic traps mostly concentrated in the Central Basin Platform. In 2014 NASA researchers reported the discovery of a 2,500 square miles (6,500 km ) methane cloud floating over

957-434: The oil- to the gas-window; subsequently, Paleozoic fields yield gas in the northeast and oil in the southwest. Furthermore, Paleozoic field locations roughly align with the northeast-trending Hogback monocline. Future Paleozoic plays will target natural gas, and these will include untested carbonates in the Central Basin Platform and potentially undiscovered plays in the Four Corners Platform. Cretaceous-aged units account for

990-614: The seaway (a.k.a. maximum transgression) was recorded by the Lewis Shale , which eventually graded into the Pictured Cliffs and the Fruitland Formation as the shoreline made its final retreat. The Western Interior Seaway's shoreline regression resulted in ample swamps, lakes, and flood plains; this resulted in the coal -rich formations of the late Mesozoic /early Cenozoic (e.g. Fruitland Formation and

1023-459: The wells have been drilled in the state of New Mexico. As of 2009, cumulative production reached 42.6 trillion cubic feet of gas and 381 million barrels of oil. The first documented oil play in the San Juan Basin occurred in 1911 on the Chaco Slope. The well was drilled to a depth of 100 m and produced only 12 barrels of oil per day. The first documented gas play occurred ten years later in

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1056-557: The western margin of the United States. Pressure on the underlying lithosphere resulting in a "depression" of the continents interior, and this allowed for the formation of the Inner Cretaceous Seaway ( a.k.a. Western Interior Seaway ). This began the transition from terrestrial sedimentation during the late Paleozoic and early Mesozoic to a shallow marine basin, as waters from the Arctic and Gulf regions poured into

1089-685: Was the collision of South America with the current-day Gulf-region, and resulted in the Ancestral Rockies - a northwest trending intercontinental mountain belt mainly through Texas, New Mexico, and Colorado. The Ancestral Rockies gave way to the Uncompahgre Mountain Range , which bound the San Juan Basin on the northeast. During the late Jurassic , continental collision of the Farallon and North American plates resulted in low-angle ("flat slab") subduction beneath

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