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157-577: The first news about the existence of the New Siberian Islands was brought by a Cossack , Yakov Permyakov , in the beginning of the 18th century. In 1712, a Cossack unit led by M. Vagin reached the Great Lyakhovsky Island . In 1809–10 Yakov Sannikov and Matvei Gedenschtrom went to the New Siberian Islands on a cartographic expedition. Sannikov reported the sighting of a "new land" north of Kotelny in 1811. This became

314-630: A bolide impact, for which an impact crater containing Manicouagan Reservoir in Quebec , Canada , has been singled out. However, the Manicouagan impact melt has been dated to 214±1 Mya. The date of the Triassic-Jurassic boundary has also been more accurately fixed recently, at 201.4 Mya. Both dates are gaining accuracy by using more accurate forms of radiometric dating, in particular the decay of uranium to lead in zircons formed at time of

471-626: A cosmopolitan distribution . Coelacanths show their highest post- Devonian diversity in the Early Triassic . Ray-finned fishes (actinopterygians) went through a remarkable diversification in the beginning of the Triassic, leading to peak diversity during the Middle Triassic; however, the pattern of this diversification is still not well understood due to a taphonomic megabias . The first stem-group teleosts appeared during

628-589: A Cossack near Kiliya . In the 16th century, these Cossack societies merged into two independent territorial organizations, as well as other smaller, still-detached groups: There are also references to the less well-known Tatar Cossacks, including the Nağaybäklär and Meshchera -speaking Volga Finns , of whom Sary Azman was the first Don ataman . These groups were assimilated by the Don Cossacks, but had their own irregular Bashkir and Meshchera Host up to

785-555: A chain of mountain ranges stretching from Turkey to Malaysia . Pangaea was fractured by widespread faulting and rift basins during the Triassic—especially late in that period—but had not yet separated. The first nonmarine sediments in the rift that marks the initial break-up of Pangaea, which separated eastern North America from Morocco , are of Late Triassic age; in the United States , these thick sediments comprise

942-505: A combined Muscovite-Swedish army and facilitate the occupation of Moscow from 1610 to 1611, riding into Moscow with Stanisław Żółkiewski . The final attempt by King Sigismund and Wladyslav to seize the throne of Muscovy was launched on April 6, 1617. Although Wladyslav was the nominal leader, it was Jan Karol Chodkiewicz who commanded the Commonwealth forces. By October, the towns of Dorogobuzh and Vyazma had surrendered. But

1099-726: A defeat, when the counterattack on Moscow by Chodkiewicz failed between Vyasma and Mozhaysk , prompted the Polish-Lithuanian army to retreat. In 1618, Petro Konashevych-Sahaidachny continued his campaign against the Tsardom of Russia on behalf of the Cossacks and the Polish-Lithuanian Commonwealth. Numerous Russian towns were sacked, including Livny and Yelets . In September 1618, with Chodkiewicz, Konashevych-Sahaidachny laid siege to Moscow, but peace

1256-474: A few exposures in the west. During the Triassic peneplains are thought to have formed in what is now Norway and southern Sweden. Remnants of this peneplain can be traced as a tilted summit accordance in the Swedish West Coast . In northern Norway Triassic peneplains may have been buried in sediments to be then re-exposed as coastal plains called strandflats . Dating of illite clay from

1413-829: A folded and faulted assemblage of Precambrian metamorphic rocks ; upper Paleozoic to Triassic sandstones and shales ; Jurassic to lower Cretaceous turbidites ; Cretaceous granites ; and ophiolites . The Anzhu Islands consist of a highly faulted and folded assemblage of Ordovician to Devonian limestones , dolomites , sandstones, shales, volcanoclastic strata, and igneous rocks; upper Paleozoic to Triassic sandstones and shales; Jurassic to lower Cretaceous turbidites; and upper Cretaceous to Pliocene sandstones and shales. The De Long Islands consist of early Paleozoic, middle Paleozoic, Cretaceous, and Neogene sedimentary and igneous (mostly basalt ) rocks. These sedimentary, metamorphic, and igneous rocks are mantled by loose Pleistocene and Holocene sediments that range in thickness from

1570-456: A fraction of a meter to about 35 meters (115 feet). Digby also noted that some early papers published about the New Siberian Islands incorrectly describe them, often along with other Arctic islands (e.g. Wrangel Island ), as being made either up almost entirely of mammoth bones and tusks or of ice, sand, and the bones of mammoths and other extinct megafauna. Some of these papers were written by persons (e.g. D. Gath Whitley) who had never visited

1727-676: A lifestyle that combined the ancient Cossack order and habits with those of the Knights Hospitaller . The Cossack structure arose, in part, in response to the struggle against Tatar raids. Socio-economic developments in the Polish-Lithuanian Commonwealth were another important factor in the growth of the Ukrainian Cossacks. During the 16th century, serfdom was imposed because of the favorable conditions for grain sales in Western Europe. This subsequently decreased

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1884-471: A long beak-like snout), and Shringasaurus (a horned herbivore which reached a body length of 3–4 metres (9.8–13.1 ft)). One group of archosauromorphs, the archosauriforms , were distinguished by their active predatory lifestyle, with serrated teeth and upright limb postures. Archosauriforms were diverse in the Triassic, including various terrestrial and semiaquatic predators of all shapes and sizes. The large-headed and robust erythrosuchids were among

2041-428: A period of some 200,000 years. Radiocarbon dates obtained from the collagen of 87 mammoth tusks and bones collected from Faddeevsky , Kotelniy , and New Siberia islands ranged from 9470±40  BP to greater than 50,000 BP (C). The entire archipelago has been designated an Important Bird Area (IBA) by BirdLife International because it supports breeding populations of many species of birds. The climate

2198-635: A prisoner of the Solovetsky Islands . Some Cossacks moved to the Danube Delta region, where they established a new sich under Ottoman rule. To prevent further defection of Cossacks, the Russian government restored the special Cossack status of the majority of Zaporozhian Cossacks. This allowed them to unite in the Host of Loyal Zaporozhians, and later to reorganize into other hosts, of which

2355-617: A pseudosuchian. Pseudosuchians were far more ecologically dominant in the Triassic, including large herbivores (such as aetosaurs ), large carnivores (" rauisuchians "), and the first crocodylomorphs (" sphenosuchians "). Aetosaurs were heavily-armored reptiles that were common during the last 30 million years of the Late Triassic until they died out at the Triassic-Jurassic extinction. Most aetosaurs were herbivorous and fed on low-growing plants, but some may have eaten meat. " rauisuchians " (formally known as paracrocodylomorphs ) were

2512-664: A reputation for their raids against the Ottoman Empire and its vassals , although they also sometimes plundered other neighbors. Their actions increased tension along the southern border of the Polish–Lithuanian Commonwealth. Low-level warfare took place in those territories for most of the period of the Commonwealth (1569–1795). Prior to the formation of the Zaporozhian Sich , Cossacks had usually been organized by Ruthenian boyars , or princes of

2669-458: A short period of time, becoming extinct about 220 million years ago. They were exceptionally abundant in the middle of the Triassic, as the primary large herbivores in many Carnian-age ecosystems. They sheared plants with premaxillary beaks and plates along the upper jaw with multiple rows of teeth. Allokotosaurs were iguana-like reptiles, including Trilophosaurus (a common Late Triassic reptile with three-crowned teeth), Teraterpeton (which had

2826-449: A strandflat of Bømlo , southern Norway, have shown that landscape there became weathered in Late Triassic times ( c. 210 million years ago) with the landscape likely also being shaped during that time. Eustatic sea level in the Triassic was consistently low compared to the other geological periods. The beginning of the Triassic was around present sea level, rising to about 10–20 metres (33–66 ft) above present-day sea level during

2983-585: A supercontinent has less shoreline compared to a series of smaller continents, Triassic marine deposits are relatively uncommon on a global scale. A major exception is in Western Europe , where the Triassic was first studied. The northeastern margin of Gondwana was a stable passive margin along the Neo-Tethys Ocean, and marine sediments have been preserved in parts of northern India and Arabia . In North America , marine deposits are limited to

3140-426: Is arctic and severe. Snow cover is present for 9 months of the year. Permafrost and underground ice are very common. The surface of the islands is covered with Arctic tundra vegetation and numerous lakes. The ocean surrounding the islands is covered with ice most of the year. During warm years, the ocean briefly opens for navigation July through October. During cold years, islands may remain ice-locked through

3297-468: Is a recent study of North American faunas. In the Petrified Forest of northeast Arizona there is a unique sequence of late Carnian-early Norian terrestrial sediments. An analysis in 2002 found no significant change in the paleoenvironment. Phytosaurs , the most common fossils there, experienced a change-over only at the genus level, and the number of species remained the same. Some aetosaurs ,

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3454-508: Is likely a paraphyletic group rather than a true clade. Tanystropheids were a family of protorosaurs which elevated their neck size to extremes, with the largest genus Tanystropheus having a neck longer than its body. The protorosaur family Sharovipterygidae used their elongated hindlimbs for gliding. Other archosauromorphs, such as rhynchosaurs and allokotosaurs , were mostly stocky-bodied herbivores with specialized jaw structures. Rhynchosaurs, barrel-gutted herbivores, thrived for only

3611-469: Is no evidence of glaciation at or near either pole; in fact, the polar regions were apparently moist and temperate , providing a climate suitable for forests and vertebrates, including reptiles. Pangaea's large size limited the moderating effect of the global ocean; its continental climate was highly seasonal, with very hot summers and cold winters. The strong contrast between the Pangea supercontinent and

3768-460: Is superimposed by 22 sea level drop events widespread in the geologic record, mostly of minor (less than 25-metre (82 ft)) and medium (25–75-metre (82–246 ft)) magnitudes. A lack of evidence for Triassic continental ice sheets suggest that glacial eustasy is unlikely to be the cause of these changes. The Triassic continental interior climate was generally hot and dry, so that typical deposits are red bed sandstones and evaporites . There

3925-653: Is the first and shortest period of the Mesozoic Era and the seventh period of the Phanerozoic Eon . Both the start and end of the period are marked by major extinction events . The Triassic Period is subdivided into three epochs: Early Triassic , Middle Triassic and Late Triassic . The Triassic began in the wake of the Permian–Triassic extinction event , which left the Earth's biosphere impoverished; it

4082-697: The Black Sea Cossack Host together with Loyal Zaporozhians. Most of the remaining Cossacks who had stayed in the Danube Delta returned to Russia in 1828. They settled in the area north of the Azov Sea , becoming known as the Azov Cossacks . The majority of Zaporizhian Cossacks who had remained loyal to Russia despite the destruction of Sich became known as Black Sea Cossacks . Both Azov and Black Sea Cossacks were resettled to colonize

4239-686: The Black Sea Host was most important. Because of land scarcity resulting from the distribution of Zaporozhian Sich lands among landlords, they eventually moved on to the Kuban region . The majority of Danubian Sich Cossacks moved first to the Azov region in 1828, and later joined other former Zaporozhian Cossacks in the Kuban region. Groups were generally identified by faith rather than language in that period, and most descendants of Zaporozhian Cossacks in

4396-578: The Carnian (early part of the Late Triassic), some advanced cynodonts gave rise to the first mammals . During the Triassic, archosaurs displaced therapsids as the largest and most ecologically prolific terrestrial amniotes. This "Triassic Takeover" may have contributed to the evolution of mammals by forcing the surviving therapsids and their mammaliaform successors to live as small, mainly nocturnal insectivores . Nocturnal life may have forced

4553-663: The Cossack szlachta . The uprising was one of a series of catastrophic events for the Commonwealth, known as The Deluge , which greatly weakened the Polish-Lithuanian Commonwealth and set the stage for its disintegration 100 years later. Influential relatives of the Ruthenian and Lithuanian szlachta in Moscow helped to create the Russian–Polish alliance against Khmelnitsky's Cossacks, portrayed as rebels against order and against

4710-760: The Danubian Sich . While Ukrainian folklore remembers the Danubian Sich, other new siches of Loyal Zaporozhians on the Bug and Dniester rivers did not achieve such fame. Other Cossacks settled on the Tisa river in the Austrian Empire , also forming a new Sich. During the Cossack sojourn under Turkish rule, a new host was founded that numbered around 12,000 people by the end of 1778. Cossack settlement on

4867-602: The Dnieper , Don , Terek , and Ural river basins, and played an important role in the historical and cultural development of both Ukraine and parts of Russia. The Cossack way of life persisted via both direct descendants and acquired ideals in other nations into the twentieth century, though the sweeping societal changes of the Russian Revolution disrupted Cossack society as much as any other part of Russia; many Cossacks migrated to other parts of Europe following

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5024-727: The Dnieper Rapids (Ukrainian: za porohamy ), also known as the Wild Fields . The group became well known, and its numbers increased greatly between the 15th and 17th centuries. The Zaporozhian Cossacks played an important role in European geopolitics , participating in a series of conflicts and alliances with the Polish–Lithuanian Commonwealth , Russia , and the Ottoman Empire . The Zaporozhians gained

5181-708: The Dniester and the Volga were mentioned in Ruthenian chronicles. Historical records of the Cossacks before the 16th century are scant, as is the history of the Ukrainian lands in that period. As early as the 15th century, a few individuals ventured into the Wild Fields , the southern frontier regions of Ukraine separating Poland-Lithuania from the Crimean Khanate. These were short-term expeditions, to acquire

5338-840: The Don and the Dnieper after the demise of the Khazars . Their arrival was probably not before the 13th century, when the Mongols broke the power of the Cumans , who had assimilated the previous population on that territory. It is known that new settlers inherited a lifestyle that long pre-dated their presence, including that of the Turkic Cumans and the Circassian Kassaks. In contrast, Slavic settlements in southern Ukraine started to appear relatively early during Cuman rule, with

5495-861: The Don Republic and the Kuban People's Republic , and the revived Hetmanate emerged in Ukraine. Cossack troops formed the effective core of the anti-Bolshevik White Army , and Cossack republics became centers for the anti-Bolshevik White movement . With the victory of the Red Army , Cossack lands were subjected to decossackization and the Holodomor famine. As a result, during the Second World War, their loyalties were divided and both sides had Cossacks fighting in their ranks. Following

5652-614: The Jurassic , when the temnospondyls had become very rare. Most of the Reptiliomorpha , stem-amniotes that gave rise to the amniotes, disappeared in the Triassic, but two water-dwelling groups survived: Embolomeri that only survived into the early part of the period, and the Chroniosuchia , which survived until the end of the Triassic. The Permian–Triassic extinction devastated terrestrial life. Biodiversity rebounded as

5809-669: The Khmelnytsky Uprising . Afterwards, the Treaty of Pereyaslav (1654) brought most of the Cossack state under Russian rule. The Sich, with its lands, became an autonomous region under the Russian protectorate. The Don Cossack Army, an autonomous military state formation of the Don Cossacks under the citizenship of the Moscow State in the Don region in 1671–1786, began a systematic conquest and colonization of lands to secure

5966-607: The Kuban steppe , a crucial foothold for Russian expansion in the Caucasus . In 1860, more Cossacks were resettled to the North Caucasus , and merged into the Kuban Cossack Host . The native land of the Cossacks is defined by a line of Russian town-fortresses located on the border with the steppe, and stretching from the middle Volga to Ryazan and Tula , then breaking abruptly to the south and extending to

6123-568: The Lake Lugano region of northern Italy and southern Switzerland , was in Middle Triassic times a lagoon behind reefs with an anoxic bottom layer, so there were no scavengers and little turbulence to disturb fossilization, a situation that can be compared to the better-known Jurassic Solnhofen Limestone lagerstätte . The remains of fish and various marine reptiles (including the common pachypleurosaur Neusticosaurus , and

6280-617: The Last Glacial Maximum (Late Weichselian Epoch). These islands represent the remains of about 1.6 million square kilometers of the formerly subaerial Great Arctic Plain that now lies submerged below parts of the Arctic Ocean , East Siberian Sea , and Laptev Sea . At this plain's greatest extent, sea level was 100–120 m below modern sea-level and the coastline lay 700 to 1000 kilometers north of its current position. This plain did not undergo extensive glaciation during

6437-658: The Newark Supergroup . Rift basins are also common in South America, Europe, and Africa. Terrestrial environments are particularly well-represented in the South Africa, Russia, central Europe, and the southwest United States. Terrestrial Triassic biostratigraphy is mostly based on terrestrial and freshwater tetrapods, as well as conchostracans ("clam shrimps"), a type of fast-breeding crustacean which lived in lakes and hypersaline environments. Because

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6594-474: The Olenekian and Anisian of Gondwana . Both kannemeyeriiform dicynodonts and gomphodont cynodonts remained important herbivores during much of the period. Therocephalians included both large predators ( Moschorhinus ) and herbivorous forms ( bauriids ) until their extinction midway through the period. Ecteniniid cynodonts played a role as large-sized, cursorial predators in the Late Triassic. During

6751-586: The Polish–Ottoman War of 1633–1634. Cossack numbers increased when the warriors were joined by peasants escaping serfdom in Russia and dependence in the Commonwealth. Attempts by the szlachta to turn the Zaporozhian Cossacks into peasants eroded the formerly strong Cossack loyalty towards the Commonwealth. The government constantly rebuffed Cossack ambitions for recognition as equal to

6908-400: The Pontic–Caspian steppe , north of the Black Sea near the Dnieper River . By the end of the 15th century, the term was also applied to peasants who had fled to the devastated regions along the Dnieper and Don Rivers , where they established their self-governing communities. Until at least the 1630s, these Cossack groups remained ethnically and religiously open to virtually anybody, although

7065-507: The Roman Catholic -dominated Commonwealth. Tensions increased when Commonwealth policies turned from relative tolerance to suppression of the Eastern Orthodox Church after the Union of Brest . The Cossacks became strongly anti-Roman Catholic, an attitude that became synonymous with anti-Polish. After the Ottoman-Polish and Polish-Muscovite warfare ceased, the official Cossack register was again reduced. The registered Cossacks ( reiestrovi kozaky ) were isolated from those who were excluded from

7222-420: The Russian Navy re-established a Soviet era naval base on Kotelny Island which had lain abandoned since 1993. The New Siberian Islands proper, or Anzhu Islands (острова Анжу, Sakha : Анжу арыылара), covering a land area of about 29,000 km, consist of: To the south and nearer to the Siberian mainland lie the Lyakhovskiye Islands (6,095 km): The small De Long Islands (228 km) lie to

7379-407: The dissolution of the Soviet Union , the Cossacks made a systematic return to Russia. Many took an active part in post-Soviet conflicts . In the 2002 Russian Census , 140,028 people reported their ethnicity as Cossack. There are Cossack organizations in Russia, Kazakhstan , Ukraine , Belarus , and the United States . The Zaporozhian Cossacks lived on the Pontic–Caspian steppe below

7536-540: The surviving species repopulated empty terrain, but these were short-lived. Diverse communities with complex food-web structures took 30 million years to reestablish. Archosauromorph reptiles, which had already appeared and diversified to an extent in the Permian Period, exploded in diversity as an adaptive radiation in response to the Permian-Triassic mass extinction. By the Early Triassic, several major archosauromorph groups had appeared. Long-necked, lizard-like early archosauromorphs were known as protorosaurs , which

7693-406: The suzerainty of the Russian Tsar from 1667 but was ruled by local hetmans for a century. The principal political problem of the hetmans who followed the Pereyeslav Agreement was defending the autonomy of the Hetmanate from Russian/Muscovite centralism. The hetmans Ivan Vyhovsky , Petro Doroshenko and Ivan Mazepa attempted to resolve this by separating Ukraine from Russia. Relations between

7850-431: The szlachta . Plans for transforming the Polish–Lithuanian two-nation Commonwealth into a Polish–Lithuanian–Ruthenian Commonwealth made little progress, due to the unpopularity among the Ruthenian szlachta of the idea of Ruthenian Cossacks being equal to them and their elite becoming members of the szlachta . The Cossacks' strong historic allegiance to the Eastern Orthodox Church also put them at odds with officials of

8007-463: The temnospondyls , giant aquatic predators that had survived the end-Permian extinction and saw a new burst of diversification in the Triassic, before going extinct by the end; however, early crown-group lissamphibians (including stem-group frogs , salamanders and caecilians ) also became more common during the Triassic and survived the extinction event. The earliest known neopterygian fish, including early holosteans and teleosts , appeared near

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8164-412: The thecodonts ) disappeared, as did most of the large labyrinthodont amphibians, groups of small reptiles, and most synapsids. Some of the early, primitive dinosaurs also became extinct, but more adaptive ones survived to evolve into the Jurassic. Surviving plants that went on to dominate the Mesozoic world included modern conifers and cycadeoids. The cause of the Late Triassic extinction is uncertain. It

8321-437: The traversodont cynodonts—were much reduced in the northern half of Pangaea ( Laurasia ). These extinctions within the Triassic and at its end allowed the dinosaurs to expand into many niches that had become unoccupied. Dinosaurs became increasingly dominant, abundant and diverse, and remained that way for the next 150 million years. The true "Age of Dinosaurs" is during the following Jurassic and Cretaceous periods, rather than

8478-488: The 16th century, with the area of the Polish-Lithuanian Commonwealth extending south, the Zaporozhian Cossacks were mostly, if tentatively, regarded by the Commonwealth as their subjects. Foreign and internal pressure on the Polish-Lithuanian Commonwealth led to the government making concessions to the Zaporozhian Cossacks. King Stephen Báthory granted them certain rights and freedoms in 1578, and they gradually began to create their foreign policy. They did so independently of

8635-417: The Anisian to Ladinian of the Tethysian domain, and from the Carnian and Rhaetian of a larger area that includes also the Boreal domain (e.g., Svalbard Islands), the North American continent, the South China block and Argentina . The best-studied of such episodes of humid climate, and probably the most intense and widespread, was the Carnian Pluvial Event . The Early Triassic was the hottest portion of

8792-405: The Carnian and include early sauropodomorphs and theropods. Most Triassic dinosaurs were small predators and only a few were common, such as Coelophysis , which was 1 to 2 metres (3.3 to 6.6 ft) long. Triassic sauropodomorphs primarily inhabited cooler regions of the world. The large predator Smok was most likely also an archosaur, but it is uncertain if it was a primitive dinosaur or

8949-409: The Cossack starshyna (nobility), their property, and their autonomy under his rule; and freed the Cossacks from the Polish sphere of influence and the land claims of the Ruthenian szlachta . Only some of the Ruthenian szlachta of the Chernigov region, who had their origins in the Moscow state, saved their lands from division among Cossacks and became part of the Cossack szlachta . After this,

9106-400: The Cossack cultural identity across the world even though the majority, especially in the Russian Federation, have little to no connection to the original Cossack people because cultural ideals and legacy changed greatly with time. Cossack organizations operate in Russia , Ukraine , Belarus , Kazakhstan , Canada , and the United States . Max Vasmer 's etymological dictionary traces

9263-413: The Cossack starshyna , including hetman Ivan Vyhovsky . The treaty failed, however, because the starshyna were divided on the issue, and it had even less support among rank-and-file Cossacks. As a result of the mid–17th century Khmelnytsky Uprising, the Zaporozhian Cossacks briefly established an independent state, which later became the autonomous Cossack Hetmanate (1649–1764). It was placed under

9420-417: The Cossack nation of the Zaporozhian Host was divided into two autonomous republics of the Russian Tsardom: the Cossack Hetmanate , and the more independent Zaporizhia . These organisations gradually lost their autonomy, and were abolished by Catherine II in the late 18th century. The Hetmanate became the governorship of Little Russia , and Zaporizhia was absorbed into New Russia . With the destruction of

9577-445: The Dnieper via Pereyaslavl . This area was settled by a population of free people practicing various trades and crafts. Triassic The Triassic ( / t r aɪ ˈ æ s ɪ k / try- ASS -ik ; sometimes symbolized 🝈 ) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya ), to the beginning of the Jurassic Period 201.4 Mya. The Triassic

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9734-448: The Early Triassic, forming small patches of reefs of modest extent compared to the great reef systems of Devonian or modern times. At the end of the Carnian, a reef crisis occurred in South China. Serpulids appeared in the Middle Triassic. Microconchids were abundant. The shelled cephalopods called ammonites recovered, diversifying from a single line that survived the Permian extinction. Bivalves began to rapidly diversify during

9891-402: The Early Triassic, while others (e.g. capitosaurs ) remained successful throughout the whole period, or only came to prominence in the Late Triassic (e.g. Plagiosaurus , metoposaurs ). The first Lissamphibians (modern amphibians) appear in the Triassic, with the progenitors of the first frogs already present by the Early Triassic. However, the group as a whole did not become common until

10048-401: The Early and Middle Triassic. Sea level rise accelerated in the Ladinian, culminating with a sea level up to 50 metres (164 ft) above present-day levels during the Carnian. Sea level began to decline in the Norian, reaching a low of 50 metres (164 ft) below present sea level during the mid-Rhaetian. Low global sea levels persisted into the earliest Jurassic. The long-term sea level trend

10205-422: The Empire in order to abolish slavery and harsh bureaucracy, and to maintain independence. The Empire responded with executions and tortures, the destruction of the western part of the Don Cossack Host during the Bulavin Rebellion in 1707–1708, the destruction of Baturyn after Mazepa's rebellion in 1708, and the formal dissolution of the Lower Dnieper Zaporozhian Host after Pugachev's Rebellion in 1775. After

10362-448: The Hetmanate and their new sovereign began to deteriorate after the autumn of 1656, when the Muscovites, going against the wishes of their Cossack partners, signed an armistice with the Polish-Lithuanian Commonwealth in Vilnius . The Cossacks considered the Vilnius agreement a breach of the contract they had entered into at Pereiaslav. For the Muscovite tsar, the Pereiaslav Agreement signified the unconditional submission of his new subjects;

10519-499: The Jurassic. There were many types of marine reptiles. These included the Sauropterygia , which featured pachypleurosaurus and nothosaurs (both common during the Middle Triassic, especially in the Tethys region), placodonts , the earliest known herbivorous marine reptile Atopodentatus , and the first plesiosaurs . The first of the lizardlike Thalattosauria ( askeptosaurs ) and the highly successful ichthyopterygians , which appeared in Early Triassic seas, soon diversified. By

10676-426: The Kuban region are bilingual, speaking both Russian and Balachka , the local Kuban dialect of central Ukrainian . Their folklore is largely Ukrainian. The predominant view of ethnologists and historians is that its origins lie in the common culture dating back to the Black Sea Cossacks. The waning loyalty of the Cossacks, and the szlachta 's arrogance towards them, resulted in several Cossack uprisings against

10833-408: The Late Pleistocene or the Last Glacial Maximum because it lay in the rain shadow of the Northern European ice sheet. During the frigid polar climate of the Last Glacial Maximum, 17,000 to 24,000 BC, small passive ice caps formed on the adjacent De Long Islands . Fragments of these ice caps remain on Jeannette , Henrietta , and Bennett Islands . Traces of former small slope and cirque glaciers in

10990-432: The Late Triassic but did not become dominant until the succeeding Jurassic Period. Archosaurs that became dominant in this period were primarily pseudosuchians , relatives and ancestors of modern crocodilians , while some archosaurs specialized in flight, the first time among vertebrates, becoming the pterosaurs . Therapsids , the dominant vertebrates of the preceding Permian period, saw a brief surge in diversification in

11147-446: The Latest Olenekian Cooling (LOC), from 248 to 247 Ma, temperatures cooled by about 6 °C. The Middle Triassic was cooler than the Early Triassic, with temperatures falling over most of the Anisian, with the exception of a warming spike in the latter portion of the stage. From 242 to 233 Ma, the Ladinian-Carnian Cooling (LCC) ensued. At the beginning of the Carnian, global temperatures continued to be relatively cool. The eruption of

11304-486: The Middle Triassic, becoming highly abundant in the oceans. Aquatic insects rapidly diversified during the Middle Triassic, with this time interval representing a crucial diversification for Holometabola , the clade containing the majority of modern insect species. In the wake of the Permian-Triassic mass extinction event , the fish fauna was remarkably uniform, with many families and genera exhibiting

11461-618: The Middle Triassic, some ichthyopterygians were achieving very large body masses. Among other reptiles, the earliest turtles , like Proganochelys and Proterochersis , appeared during the Norian Age (Stage) of the Late Triassic Period. The Lepidosauromorpha , specifically the Sphenodontia , are first found in the fossil record of the earlier Carnian Age, though the earliest lepidosauromorphs likely occurred in

11618-479: The New Siberian Islands and relied upon anecdotes of traders and travelers and local folklore for their descriptions of them, and other articles were written by explorers and ivory hunters untrained in either geology or other sciences. Such statements have been shown to be fictional in nature by detailed studies of the geology of the New Siberian Islands by professional geologists, paleontologists, and other scientists. As noted by Baron Eduard V. Toll in his account of

11775-422: The New Siberian Islands, sizeable and economically significant accumulations of fossil ivory occur within them. The ivory, along with mammoth and other bones, are found in recent beaches, drainage areas, river terraces and river beds. The New Siberian Islands are unique in the burial and preservation of fossil ivory "in such a wonderful state of preservation that the tusks so found cannot be distinguished from

11932-627: The Ottomans, to ease pressure on their own borders. Many Cossacks and Tatars developed longstanding enmity due to the losses of their raids. The ensuing chaos and cycles of retaliation often turned the entire southeastern Polish–Lithuanian Commonwealth border into a low-intensity war zone. It catalyzed escalation of Commonwealth–Ottoman warfare, from the Moldavian Magnate Wars (1593–1617) to the Battle of Cecora (1620) , and campaigns in

12089-585: The Perestroika era in the late 1980s, descendants of Cossacks began to revive their national traditions. In 1988, the Soviet Union enacted a law permitting the re-establishment of former Cossack hosts and the formation of new ones. Throughout the 1990s, numerous regional authorities consented to delegate certain local administrative and policing responsibilities to these reconstituted Cossack hosts. Between 3.5 and 5 million people associate themselves with

12246-505: The Permian extinction, Archaeplastida (red and green algae) had been the major marine phytoplanktons since about 659–645 million years ago, when they replaced marine planktonic cyanobacteria , which first appeared about 800 million years ago, as the dominant phytoplankton in the oceans. In the Triassic, secondary endosymbiotic algae became the most important plankton. In marine environments , new modern types of corals appeared in

12403-475: The Permian. The Procolophonidae , the last surviving parareptiles , were an important group of small lizard-like herbivores. The drepanosaurs were a clade of unusual, chameleon-like arboreal reptiles with birdlike heads and specialised claws. Three therapsid groups survived into the Triassic: dicynodonts , therocephalians , and cynodonts . The cynodont Cynognathus was a characteristic top predator in

12560-640: The Polish government. Cossack rebellions eventually culminated in the Khmelnytsky Uprising , led by the hetman of the Zaporizhian Sich, Bohdan Khmelnytsky . The Zaporozhian Sich had its own authorities, its own "Lower" Zaporozhian Host , and its own land. In 1775, the Lower Dnieper Zaporozhian Host was destroyed. Later, its high-ranking Cossack leaders were exiled to Siberia, its last chief, Petro Kalnyshevsky , becoming

12717-552: The Polish-Lithuanian Commonwealth to create a third constituent, comparable in status to that of the Grand Duchy of Lithuania. The Union of Hadiach provoked a war between the Cossacks and the Muscovites/Russians that began in the fall of 1658. In June 1659, the two armies met near the town of Konotop . One army comprised Cossacks, Tatars, and Poles, and the other was led by a top Muscovite military commander of

12874-676: The Polish–Lithuanian Commonwealth and the Lower Dnieper (Nyzovyi in Ukrainian) Cossack Host under the joint protectorate of Russia and the Commonwealth. By the end of the 18th century, Cossack nations had been transformed into a special military estate ( sosloviye ), "a military class". The Malorussian Cossacks (the former Registered Cossacks also known as "Town Zaporozhian Host") were excluded from this transformation, but were promoted to membership of various civil estates or classes (often Russian nobility), including

13031-519: The Polish–Lithuanian Commonwealth in the early 17th century. Finally, the King's adamant refusal to accede to the demand to expand the Cossack Registry prompted the largest and most successful of these: the Khmelnytsky Uprising , that began in 1648. Some Cossacks, including the Polish szlachta in Ukraine, converted to Eastern Orthodoxy, divided the lands of the Ruthenian szlachta , and became

13188-1013: The Pugachev rebellion, the Empire renamed the Yaik Host, its capital, the Yaik Cossacks, and the Cossack town of Zimoveyskaya in the Don region to try to encourage the Cossacks to forget the men and their uprisings. It also formally dissolved the Lower Dnieper Zaporozhian Cossack Host, and destroyed their fortress on the Dnieper (the Sich itself). This may in part have been due to the participation of some Zaporozhian and other Ukrainian exiles in Pugachev's rebellion. During his campaign, Pugachev issued manifestos calling for restoration of all borders and freedoms of both

13345-604: The Russian border was approved by the Ottoman Empire after the Cossacks officially vowed to serve the sultan . Yet internal conflict, and the political manoeuvring of the Russian Empire led to splits among the Cossacks. Some of the runaway Cossacks returned to Russia, where the Russian army used them to form new military bodies that also incorporated Greeks, Albanians and Crimean Tatars. After the Russo-Turkish war of 1787–1792 , most of these Cossacks were absorbed into

13502-808: The Russian navy had no Cossack ships and units. Cossack service was considered rigorous. Cossack forces played an important role in Russia's wars of the 18th–20th centuries, including the Great Northern War , the Seven Years' War , the Crimean War , the Napoleonic Wars , the Caucasus War , many Russo-Persian Wars , many Russo-Turkish Wars , and the First World War . In the late 19th and early 20th centuries,

13659-506: The Ruthenian szlachta refrained from plans to have a Moscow Tsar as king of the Commonwealth, its own Michał Korybut Wiśniowiecki later becoming king. The last, ultimately unsuccessful, attempt to rebuild the Polish–Cossack alliance and create a Polish–Lithuanian–Ruthenian Commonwealth was the 1658 Treaty of Hadiach . The treaty was approved by the Polish king and the Sejm , and by some of

13816-734: The Slavic element predominated . There were several major Cossack hosts in the 16th century: near the Dnieper, Don, Volga and Ural Rivers ; the Greben Cossacks in Caucasia ; and the Zaporozhian Cossacks , mainly west of the Dnieper. It is unclear when people other than the Brodnici and Berladnici (which had a Romanian origin with large Slavic influences) began to settle in the lower reaches of major rivers such as

13973-462: The Tatars and Turks. Tsar Boris Godunov had incurred the hatred of Ukrainian Cossacks by ordering the Don Cossacks to drive away from the Don all the Ukrainian Cossacks fleeing the failed uprisings of the 1590s. This contributed to the Ukrainian Cossacks' willingness to fight against him. In 1604, 2,000 Zaporizhian Cossacks fought on the side of the Polish-Lithuanian Commonwealth and their proposal for

14130-472: The Triassic (teleosts are by far the most diverse group of fish today). Predatory actinopterygians such as saurichthyids and birgeriids , some of which grew over 1.2 m (3.9 ft) in length, appeared in the Early Triassic and became widespread and successful during the period as a whole. Lakes and rivers were populated by lungfish (Dipnoi), such as Ceratodus , which are mainly known from

14287-532: The Triassic was mostly hot and dry, with deserts spanning much of Pangaea's interior. However, the climate shifted and became more humid as Pangaea began to drift apart. The end of the period was marked by yet another major mass extinction, the Triassic–Jurassic extinction event , that wiped out many groups, including most pseudosuchians, and allowed dinosaurs to assume dominance in the Jurassic. The Triassic

14444-609: The Triassic, enlarging the Neo-Tethys Ocean which formed in their wake. At the same time, they forced the Paleo-Tethys Ocean to shrink as it was being subducted under Asia. By the end of the Triassic, the Paleo-Tethys Ocean occupied a small area and the Cimmerian terranes began to collide with southern Asia. This collision, known as the Cimmerian Orogeny , continued into the Jurassic and Cretaceous to produce

14601-428: The Triassic, with dicynodonts and cynodonts quickly becoming dominant, but they declined throughout the period with the majority becoming extinct by the end. However, the first stem-group mammals ( mammaliamorphs ), themselves a specialized subgroup of cynodonts, appeared during the Triassic and would survive the extinction event, allowing them to radiate during the Jurassic. Amphibians were primarily represented by

14758-526: The Tsar ( Dmitri I ), against the Muscovite army. By September 1604, Dmitri I had gathered a force of 2,500 men, of whom 1,400 were Cossacks. Two thirds of these "cossacks", however, were in fact Ukrainian civilians, only 500 being professional Ukrainian Cossacks. On July 4, 1610, 4,000 Ukrainian Cossacks fought in the Battle of Klushino , on the side of the Polish-Lithuanian Commonwealth. They helped to defeat

14915-659: The Tsarist regime used Cossacks extensively to perform police service. Cossacks also served as border guards on national and internal ethnic borders, as had been the case in the Caucasus War. During the Russian Civil War , Don and Kuban Cossacks were the first people to declare open war against the Bolsheviks . In 1918, Russian Cossacks declared their complete independence, creating two independent states,

15072-409: The Ukrainian hetman considered it a conditional contract from which one party could withdraw if the other was not upholding its end of the bargain. The Ukrainian hetman Ivan Vyhovsky, who succeeded Khmelnytsky in 1657, believed the Tsar was not living up to his responsibility. Accordingly, he concluded a treaty with representatives of the Polish king, who agreed to re-admit Cossack Ukraine by reforming

15229-839: The Wrangellia Large Igneous Province around 234 Ma caused abrupt global warming, terminating the cooling trend of the LCC. This warming was responsible for the Carnian Pluvial Event and resulted in an episode of widespread global humidity. The CPE ushered in the Mid-Carnian Warm Interval (MCWI), which lasted from 234 to 227 Ma. At the Carnian-Norian boundary occurred a positive δ C excursion believed to signify an increase in organic carbon burial. From 227 to 217 Ma, there

15386-480: The Zaporizhian Sich, a number of Ukrainian-speaking Eastern Orthodox Zaporozhian Cossacks fled to the territory under control of the Ottoman Empire . Together with Cossacks of Greater Russian origin , as well as the vast majority of Old Believers and other people from "Greater Russia" ( Muscovy ), they settled in the area of the Danube river, and founded a new Sich. Many Ukrainian peasants and adventurers later joined

15543-415: The beginning of the Triassic, and quickly diversified to become among the dominant groups of fish in both freshwater and marine habitats. The vast supercontinent of Pangaea dominated the globe during the Triassic, but in the latest Triassic ( Rhaetian ) and Early Jurassic it began to gradually rift into two separate landmasses: Laurasia to the north and Gondwana to the south. The global climate during

15700-455: The bizarre long-necked archosauromorph Tanystropheus ), along with some terrestrial forms like Ticinosuchus and Macrocnemus , have been recovered from this locality. All these fossils date from the Anisian and Ladinian ages (about 242 Ma ago). The Triassic Period ended with a mass extinction, which was particularly severe in the oceans; the conodonts disappeared, as did all

15857-773: The borders on the Volga , the whole of Siberia (see Yermak Timofeyevich ), and the Yaik (Ural) and Terek Rivers . Cossack communities had developed along the latter two rivers well before the arrival of the Don Cossacks. By the 18th century, Cossack hosts in the Russian Empire occupied effective buffer zones on its borders. The expansionist ambitions of the Empire relied on ensuring Cossack loyalty, which caused tension given their traditional exercise of freedom, democracy, self-rule, and independence. Cossacks such as Stenka Razin , Kondraty Bulavin , Ivan Mazepa and Yemelyan Pugachev led major anti-imperial wars and revolutions in

16014-484: The conditions of the Union of Hadiach. In 1660, however, the hetman asked the Polish king for protection, leading to the period of Ukrainian history known as The Ruin . Historian Gary Dean Peterson writes: "With all this unrest, Ivan Mazepa of the Ukrainian Cossacks was looking for an opportunity to secure independence from Russia and Poland". In response to Mazepa's alliance with Charles XII of Sweden , Peter I ordered

16171-412: The corresponding rocks are referred to as Lower, Middle, or Upper Triassic. The faunal stages from the youngest to oldest are: During the Triassic, almost all the Earth's land mass was concentrated into a single supercontinent , Pangaea ( lit.   ' entire land ' ). This supercontinent was more-or-less centered on the equator and extended between the poles, though it did drift northwards as

16328-506: The dental plates, abundant in the fossils record. Hybodonts , a group of shark-like cartilaginous fish , were dominant in both freshwater and marine environments throughout the Triassic. Last survivors of the mainly Palaeozoic Eugeneodontida are known from the Early Triassic. Temnospondyl amphibians were among those groups that survived the Permian–Triassic extinction. Once abundant in both terrestrial and aquatic environments,

16485-402: The development of the Cossacks. In the 15th century, Cossack society was described as a loose federation of independent communities, which often formed local armies and were entirely independent from neighboring states such as Poland, the Grand Duchy of Moscow, and the Crimean Khanate. According to Mykhailo Hrushevsky , the first mention of Cossacks dates back to the 14th century, although

16642-428: The dominant carnivores in the early Triassic. Phytosaurs were a particularly common group which prospered during the Late Triassic. These long-snouted and semiaquatic predators resemble living crocodiles and probably had a similar lifestyle, hunting for fish and small reptiles around the water's edge. However, this resemblance is only superficial and is a prime-case of convergent evolution. True archosaurs appeared in

16799-482: The earliest, such as Oleshky , dating back to the 11th century. Early "Proto-Cossack" groups are generally reported to have come into existence within what is now Ukraine in the 13th century as the influence of Cumans grew weaker, although some have ascribed their origins to as early as the mid-8th century. Some historians suggest that the Cossack people were of mixed ethnic origin, descending from East Slavs , Turks , Tatars , and others who settled or passed through

16956-458: The early Triassic, splitting into two branches: Avemetatarsalia (the ancestors to birds) and Pseudosuchia (the ancestors to crocodilians). Avemetatarsalians were a minor component of their ecosystems, but eventually produced the earliest pterosaurs and dinosaurs in the Late Triassic. Early long-tailed pterosaurs appeared in the Norian and quickly spread worldwide. Triassic dinosaurs evolved in

17113-465: The end of the 19th century. The Kalmyk and Buryat Cossacks also deserve mention . The Zaporizhian Sich became a vassal polity of the Polish–Lithuanian Commonwealth during feudal times. Under increasing pressure from the Polish–Lithuanian Commonwealth, in the mid-17th century the Sich declared an independent Cossack Hetmanate . The Hetmanate was initiated by a rebellion under Bohdan Khmelnytsky against Polish and Catholic domination, known as

17270-640: The entire Phanerozoic, seeing as it occurred during and immediately after the discharge of titanic volumes of greenhouse gases from the Siberian Traps. The Early Triassic began with the Permian-Triassic Thermal Maximum (PTTM) and was followed by the brief Dienerian Cooling (DC) from 251 to 249 Ma, which was in turn followed by the Latest Smithian Thermal Maximum (LSTT) around 249 to 248 Ma. During

17427-552: The era, Prince Aleksey Trubetskoy . After terrible losses, Trubetskoy was forced to withdraw to the town of Putyvl on the other side of the border. The battle is regarded as one of the Zaporizhian Cossacks' most impressive victories. In 1659, Yurii Khmelnytsky was elected hetman of the Zaporizhian Host/Hetmanate, with the endorsement of Moscow and supported by common Cossacks unhappy with

17584-622: The establishment of the Soviet Union , while others remained and assimilated into the Communist state. Cohesive Cossack-based units were organized and many fought for both Nazi Germany and the Soviet Union during World War II . After World War II, the Soviet Union disbanded the Cossack units within the Soviet Army, leading to the suppression of many Cossack traditions during the rule of Joseph Stalin and his successors. However, during

17741-536: The extinct family Cheirolepidiaceae , which first appeared in the Late Triassic, and would be prominent throughout most of the rest of the Mesozoic. No known coal deposits date from the start of the Triassic Period. This is known as the Early Triassic "coal gap" and can be seen as part of the Permian–Triassic extinction event . Possible explanations for the coal gap include sharp drops in sea level at

17898-687: The form of buried ground ice deposits are preserved on Zhokhov Island . The sea submerged the Great Arctic Plain (except for the New Siberian and other isolated islands) within a relatively short time span of 7,000 years during the Early–Middle Holocene . As noted by Digby and numerous later publications, this archipelago consists of a mixture of folded and faulted sedimentary and igneous rocks ranging in age from Precambrian to Pliocene . The Lyakhovsky Islands consist of

18055-521: The global ocean triggered intense cross-equatorial monsoons , sometimes referred to as the Pangean megamonsoons . The Triassic may have mostly been a dry period, but evidence exists that it was punctuated by several episodes of increased rainfall in tropical and subtropical latitudes of the Tethys Sea and its surrounding land. Sediments and fossils suggestive of a more humid climate are known from

18212-494: The government, and often against its interests, as for example with their role in Moldavian affairs, and with the signing of a treaty with Emperor Rudolf II in the 1590s. Registered Cossacks formed a part of the Commonwealth army until 1699. Around the end of the 16th century, increasing Cossack aggression strained relations between the Commonwealth and the Ottoman Empire. Cossacks had begun raiding Ottoman territories during

18369-406: The ice in sleds drawn by dogs and reached the south coast of Great Lyakhovsky Island. Along the southern coast of this island he found well-preserved bones, ivory, peat, wood, and even a tree within 40-meter (130-foot) high sea cliffs that expose Late Pleistocene sediments. These sediments are cemented by permafrost and have accumulated periodically over the last 200,000 years. In September 2014,

18526-420: The impact. So, the evidence suggests the Manicouagan impact preceded the end of the Triassic by approximately 10±2 Ma. It could not therefore be the immediate cause of the observed mass extinction. The number of Late Triassic extinctions is disputed. Some studies suggest that there are at least two periods of extinction towards the end of the Triassic, separated by 12 to 17 million years. But arguing against this

18683-401: The keystone predators of most Triassic terrestrial ecosystems. Over 25 species have been found, including giant quadrupedal hunters, sleek bipedal omnivores, and lumbering beasts with deep sails on their backs. They probably occupied the large-predator niche later filled by theropods. "Rauisuchians" were ancestral to small, lightly-built crocodylomorphs, the only pseudosuchians which survived into

18840-615: The locals in war, by raising the Cossack registry in times of hostility, and then radically decreasing it and forcing the Cossacks back into serfdom in times of peace. This institutionalized method of control bred discontent among the Cossacks. By the end of the 16th century, they began to revolt, in the uprisings of Kryshtof Kosynsky (1591–1593), Severyn Nalyvaiko (1594–1596), Hryhorii Loboda (1596), Marko Zhmailo (1625), Taras Fedorovych (1630), Ivan Sulyma (1635), Pavlo Pavliuk and Dmytro Hunia (1637), and Yakiv Ostrianyn and Karpo Skydan (1638). All were brutally suppressed and ended by

18997-412: The locals' land allotments and freedom of movement. In addition, the Polish-Lithuanian Commonwealth government attempted to impose Catholicism, and to Polonize the local Ukrainian population. The basic form of resistance and opposition by the locals and burghers was flight and settlement in the sparsely populated steppe. The major powers tried to exploit Cossack military power for their own purposes. In

19154-545: The mammaliaforms to develop fur and a higher metabolic rate . Two Early Triassic lagerstätten (high-quality fossil beds), the Dienerian aged Guiyang biota and the earliest Spathian aged Paris biota stand out due to their exceptional preservation and diversity . They represent the earliest lagerstätten of the Mesozoic era and provide insight into the biotic recovery from the Permian-Triassic mass extinction event. The Monte San Giorgio lagerstätte, now in

19311-453: The marine reptiles except ichthyosaurs and plesiosaurs . Invertebrates like brachiopods and molluscs (such as gastropods ) were severely affected. In the oceans, 22% of marine families and possibly about half of marine genera went missing. Though the end-Triassic extinction event was not equally devastating in all terrestrial ecosystems, several important clades of crurotarsans (large archosaurian reptiles previously grouped together as

19468-409: The military duty to serve in the irregular troops: Zaporozhian Cossacks were mostly infantry soldiers, using war wagons, while Don Cossacks were mostly cavalry soldiers. The various Cossack groups were organized along military lines, with large autonomous groups called hosts . Each host had a territory consisting of affiliated villages called stanitsas . They inhabited sparsely populated areas in

19625-458: The modern Pacific Ocean . Practically all deep-ocean crust present during the Triassic has been recycled through the subduction of oceanic plates, so very little is known about the open ocean from this time period. Most information on Panthalassan geology and marine life is derived from island arcs and rare seafloor sediments accreted onto surrounding land masses, such as present-day Japan and western North America. The eastern edge of Pangea

19782-609: The mouth of the Dnieper river. In 1615 and 1625, Cossacks razed suburbs of Constantinople , forcing the Ottoman Sultan to flee his palace. In 1637, the Zaporozhian Cossacks, joined by the Don Cossacks , captured the strategic Ottoman fortress of Azov , which guarded the Don. The Zaporizhian Cossacks became particularly strong in the first quarter of the 17th century under the leadership of hetman Petro Konashevych-Sahaidachny , who launched successful campaigns against

19939-424: The myth of Zemlya Sannikova or Sannikov Land . In 1886, Russian polar explorer and scientist Eduard Toll , during his first visit to the New Siberian Islands, thought that he had seen an unknown land north of Kotelny Island. He guessed that this was the so-called Zemlya Sannikova . Toll paid a further visit to the island group in the spring of 1892, accompanied by one Cossack and three natives. He traveled over

20096-591: The name to the Turkic word kazak , kozak , in which cosac meant 'free man' but also 'conqueror'. The ethnonym Kazakh is from the same Turkic root. In written sources, the name is first attested in the Codex Cumanicus from the 13th century. In English , Cossack is first attested in 1590. The origins of the Cossacks are disputed. Originally, the term referred to semi-independent Tatar groups ( qazaq or "free men") who inhabited

20253-439: The newly created civil estate of Cossacks. Similar to the knights of medieval Europe in feudal times, or to the tribal Roman auxiliaries, the Cossacks had to obtain their cavalry horses , arms, and supplies for their military service at their own expense, the government providing only firearms and supplies. Lacking horses, the poor served in the Cossack infantry and artillery. In the navy alone, Cossacks served with other peoples as

20410-430: The next most common tetrapods, and early dinosaurs, passed through unchanged. However, both phytosaurs and aetosaurs were among the groups of archosaur reptiles completely wiped out by the end-Triassic extinction event. It seems likely then that there was some sort of end-Carnian extinction, when several herbivorous archosauromorph groups died out, while the large herbivorous therapsids —the kannemeyeriid dicynodonts and

20567-494: The nobility, especially various Lithuanian starostas . Merchants, peasants, and runaways from the Polish–Lithuanian Commonwealth, Muscovy , and Moldavia also joined the Cossacks. The first recorded sich prototype was formed by the starosta of Cherkasy and Kaniv , Dmytro Vyshnevetsky , who built a fortress on the island of Little Khortytsia on the banks of the Lower Dnieper in 1552. The Zaporozhian Host adopted

20724-456: The nominal suzerainty of various Eastern European states at the time, were allowed a great degree of self-governance in exchange for military service. Although numerous linguistic and religious groups came together to form the Cossacks, most of them coalesced and became East Slavic -speaking Orthodox Christians . The rulers of the Polish–Lithuanian Commonwealth and Russian Empire endowed Cossacks with certain special privileges in return for

20881-524: The north-east of Novaya Sibir. The New Siberian Islands are low-lying. Their highest point is located on Bennett island, with an elevation of 426 m. They are part of the East Siberian Lowland , forming a geographical continuum with the continental plains further south. The New Siberian Islands once formed major hills within the Great Arctic Plain that covered the northern part of Late Pleistocene " Beringia " between Siberia and Alaska during

21038-469: The order Isoetales (which contains living quillworts ), rose to prominence due to the environmental instability following the Permian-Triassic extinction, with one particularly notable example being the genus Pleuromeia , which grew in columnar like fashion, sometimes reaching a height of 2 metres (6.6 ft). The relevance of lycophytes declined from the Middle Triassic onwards, following

21195-504: The period progressed. Southern Pangea, also known as Gondwana , was made up by closely-appressed cratons corresponding to modern South America , Africa , Madagascar , India , Antarctica , and Australia . North Pangea, also known as Laurussia or Laurasia , corresponds to modern-day North America and the fragmented predecessors of Eurasia . The western edge of Pangea lay at the margin of an enormous ocean, Panthalassa ( lit.   ' entire sea ' ), which roughly corresponds to

21352-645: The private property of the Ruthenian Orthodox szlachta . Don Cossacks' raids on Crimea left Khmelnitsky without the aid of his usual Tatar allies. From the Russian perspective, the rebellion ended with the 1654 Treaty of Pereyaslav , in which, in order to overcome the Russian–Polish alliance against them, the Khmelnitsky Cossacks pledged their loyalty to the Russian Tsar . In return, the Tsar guaranteed them his protection; recognized

21509-511: The reference was to people who were either Turkic or of undefined origin. Hrushevsky states that the Cossacks may have descended from the long-forgotten Antes , or from groups from the Berlad territory of the Brodnici in present-day Romania , then a part of the Grand Duchy of Halych. There, the Cossacks may have served as self-defence formations, organized to defend against raids conducted by neighbors. The first international mention of Cossacks

21666-525: The register, and from the Zaporizhian Host. This, together with intensified socioeconomic and national-religious oppression of the other classes in Ukrainian society, led to many Cossack uprisings in the 1630s. The nobility, which had obtained legal ownership of vast expanses of land on the Dnipro from the Polish kings, attempted to impose feudal dependency on the local population. Landowners utilized

21823-502: The resources of what was a naturally rich and fertile region teeming with cattle, wild animals, and fish. This lifestyle, based on subsistence agriculture , hunting, and either returning home in the winter or settling permanently, came to be known as the Cossack way of life. Crimean–Nogai slave raids in Eastern Europe caused considerable devastation and depopulation in this area. The Tatar raids also played an important role in

21980-487: The return of more stable environmental conditions. While having first appeared during the Permian, the extinct seed plant group Bennettitales first became a prominent element in global floras during the Late Triassic, a position they would hold for much of the Mesozoic. In the Southern Hemisphere landmasses of Gondwana, the tree Dicroidium , an extinct " seed fern " belong to the order Corystospermales

22137-582: The sacking of the then capital of the Hetmanate, Baturyn . The city was burnt and looted, and 11,000 to 14,000 of its inhabitants were killed. The destruction of the Hetmanate's capital was a signal to Mazepa and the Hetmanate's inhabitants of severe punishment for disloyalty to the Tsar's authority. The Zaporizhian Sich at Chortomlyk , which had existed since 1652, was also destroyed by Peter I's forces in 1709, in retribution for decision of its otaman Kost Hordiyenko , to ally with Mazepa. Under Russian rule,

22294-420: The second part of the 16th century. The Polish government could not control them, but was held responsible as the men were nominally its subjects. In retaliation, Tatars living under Ottoman rule launched raids into the Commonwealth, mostly in the southeast territories. Cossack pirates responded by raiding wealthy trading port-cities in the heart of the Ottoman Empire, as these were just two days away by boat from

22451-412: The sixteenth century the Cossack were increasingly joined by Slavs such as Russians and Poles, Balto-slavic Lithuanians and people from today's Ukraine, thus becoming a Slav-Tatar ethnic hybrid. As the grand duchies of Moscow and Lithuania grew in power, new political entities appeared in the region. These included Moldavia and the Crimean Khanate . In 1261, Slavic people living in the area between

22608-435: The summer. Polar night conditions are present November through February, and, conversely, the Sun remains above the horizon continuously during summer months. Cossack The Cossacks are a predominantly East Slavic Eastern Christian people originating in the Pontic–Caspian steppe of eastern Ukraine and southern Russia . Historically, they were a semi- nomadic and semi-militarized people, who, while under

22765-454: The terminus of the Triassic, there was an extreme warming event referred to as the End-Triassic Thermal Event (ETTE), which was responsible for the Triassic-Jurassic mass extinction. Bubbles of carbon dioxide in basaltic rocks dating back to the end of the Triassic indicate that volcanic activity from the Central Atlantic Magmatic Province helped trigger climate change in the ETTE. During the Early Triassic, lycophytes , particularly those of

22922-527: The terrestrial species had mostly died out during the extinction event. The Triassic survivors were aquatic or semi-aquatic, and were represented by Tupilakosaurus , Thabanchuia , Branchiosauridae and Micropholis , all of which died out in Early Triassic, and the successful Stereospondyli , with survivors into the Cretaceous Period. The largest Triassic stereospondyls, such as Mastodonsaurus , were up to 4 to 6 metres (13 to 20 ft) in length. Some lineages (e.g. trematosaurs ) flourished briefly in

23079-513: The time of the Permo-Triassic boundary; acid rain from the Siberian Traps eruptions or from an impact event that overwhelmed acidic swamps; climate shift to a greenhouse climate that was too hot and dry for peat accumulation; evolution of fungi or herbivores that were more destructive of wetlands; the extinction of all plants adapted to peat swamps, with a hiatus of several million years before new plant species evolved that were adapted to peat swamps; or soil anoxia as oxygen levels plummeted. Before

23236-437: The vast Steppe. Some Turkologists , however, argue that Cossacks are descendants of the native Cumans of Ukraine , who had lived there long before the Mongol invasion. some other just state that first Cossacks were Turkic origin according to Serhii Plokhy first Cossacks were of Turkic rather than Slavic stock. Christoph Baumer state that predesecessor from the thirteenth century on were mainly of Turkic stock, but from

23393-583: The very best and purest ivory". The abundant bones, even skeletons, of mammoth, rhinoceros, musk-ox, and other megafauna along with the mammoth ivory found in these islands are preserved by permafrost , in which they are encased. The permafrost periodically developed in Late Pleistocene loess , solifluction , pond , and stream sediments as they accumulated. The radiocarbon dating of bones, ivory, and plants, optically stimulated luminescence dating of enclosing sediments, and uranium-thorium dating of associated peats demonstrate that they accumulated over

23550-427: Was a dominant element in forest habitats across the region during the Middle-Late Triassic. During the Late Triassic, the Ginkgoales (which today are represented by only a single species, Ginkgo biloba ) underwent considerable diversification. Conifers were abundant during the Triassic, and included the Voltziales (which contains various lineages, probably including those ancestral to modern conifers), as well as

23707-457: Was a relatively cool period known as the Early Norian Cool Interval (ENCI), after which occurred the Mid-Norian Warm Interval (MNWI) from 217 to 209 Ma. The MNWI was briefly interrupted around 214 Ma by a cooling possibly related to the Manicouagan impact . Around 212 Ma, a 10 Myr eccentricity maximum caused a paludification of Pangaea and a reduction in the size of arid climatic zones. The Rhaetian Cool Interval (RCI) lasted from 209 to 201 Ma. At

23864-415: Was accompanied by huge volcanic eruptions that occurred as the supercontinent Pangaea began to break apart about 202 to 191 million years ago (40Ar/39Ar dates), forming the Central Atlantic Magmatic Province (CAMP), one of the largest known inland volcanic events since the planet had first cooled and stabilized. Other possible but less likely causes for the extinction events include global cooling or even

24021-428: Was encroached upon by a pair of extensive oceanic basins: The Neo-Tethys (or simply Tethys) and Paleo-Tethys Oceans . These extended from China to Iberia, hosting abundant marine life along their shallow tropical peripheries. They were divided from each other by a long string of microcontinents known as the Cimmerian terranes . Cimmerian crust had detached from Gondwana in the early Permian and drifted northwards during

24178-430: Was in 1492, when Crimean Khan Meñli I Giray complained to Grand Duke of Lithuania Alexander Jagiellon that his Cossack subjects from Kiev and Cherkasy had pillaged a Crimean Tatar ship: the duke ordered his "Ukrainian" (meaning borderland) officials to investigate, execute the guilty, and give their belongings to the khan. Sometime in the 16th century, there appeared the old Ukrainian Ballad of Cossack Holota , about

24335-451: Was named in 1834 by Friedrich August von Alberti , after a succession of three distinct rock layers (Greek triás meaning 'triad') that are widespread in southern Germany : the lower Buntsandstein (colourful sandstone ) , the middle Muschelkalk (shell-bearing limestone ) and the upper Keuper (coloured clay ). On the geologic time scale , the Triassic is usually divided into Early , Middle , and Late Triassic Epochs , and

24492-425: Was secured. Consecutive treaties between the Ottoman Empire and the Polish–Lithuanian Commonwealth called for the governments to keep the Cossacks and Tatars in check, but neither enforced the treaties strongly. The Polish forced the Cossacks to burn their boats and stop raiding by sea, but the activity did not cease entirely. During this time, the Habsburg monarchy sometimes covertly hired Cossack raiders against

24649-468: Was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles , especially archosaurs , were the chief terrestrial vertebrates during this time. A specialized group of archosaurs, called dinosaurs , first appeared in

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