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South Anuyi Ocean
The South Anuyi Ocean or Angayucham Ocean is a hypothesized ancient ocean, interpreted from the South Anuyi suture zone in eastern Siberia. Development of the concept Mapping of the northeastern continental shelf of Russia throughout the early 1980s culminated in a report on the "Geological Structure of the USSR: Seas of the Soviet Arctic." Most researchers interpreted the entire shelf as a single continental margin plate. In 1988 an alternate hypothesis interpreted the rocks of the South Anuyi suture as the remnants of an ancient ocean basin. According to this model, Wrangel, De Long and the New Siberian Islands and the parts of the Chukchi microcontinent were part of a small continent, Arctica. They subsequently broke off and approached Siberia during the Albian. See also * Wrangellia The Wrangellia Terrane (named for the Wrangell Mountains, Alaska) is a crustal fragment (terrane) extending from the south-central part of Alaska and along the Coast of British Columbia in C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albian
The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 Ma (million years ago). The Albian is preceded by the Aptian and followed by the Cenomanian. Stratigraphic definitions The Albian Stage was first proposed in 1842 by Alcide d'Orbigny. It was named after Alba, the Latin name for River Aube in France. A Global Boundary Stratotype Section and Point (GSSP), ratified by the IUGS in 2016, defines the base of the Albian as the first occurrence of the planktonic foraminiferan '' Microhedbergella renilaevis'' at the Col de Pré-Guittard section, Arnayon, Drôme, France. The top of the Albian Stage (the base of the Cenomanian Stage and Upper Cretaceous Series) is defined as the place where the foram species '' Rotalipora globotruncanoides'' first appears in the stratigraphic column. The Albia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrangellia
The Wrangellia Terrane (named for the Wrangell Mountains, Alaska) is a crustal fragment (terrane) extending from the south-central part of Alaska and along the Coast of British Columbia in Canada. Some geologists contend that Wrangellia extends southward to Oregon, although this is not generally accepted. Extent and terminology The term Wrangellia is confusingly applied to all of: * The Wrangell(ia) Terrane alone; * A composite terrane (CT) consisting of the Wrangell Terrane, Peninsular Terrane, and other rock units that were not originally part of the North American craton; * A composite terrane which also includes the Alexander Terrane. Earlier geologists sometimes used the term " Talkeetna Superterrane" to describe Wrangellia. Origin There are two conflicting hypotheses about whether the Wrangellia Superterrane originated at polar or equatorial latitudes: # That Wrangellia accreted at a northerly latitude near its current location (when North America, or Laurentia, was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Ancient Oceans
This is a list of former oceans that disappeared due to tectonic movements and other geographical and climatic changes. In alphabetic order: List * Bridge River Ocean, the ocean between the ancient Insular Islands (that is, Stikinia) and North America * Cache Creek Ocean, a Paleozoic ocean between the Wrangellia Superterrane and Yukon-Tanana Terrane * Iapetus Ocean, the Southern hemisphere ocean between Baltica and Avalonia * Kahiltna-Nutotzin Ocean, Mesozoic * Khanty Ocean, the Precambrian to Silurian ocean between Baltica and the Siberian continent * Medicine Hat Ocean * Mezcalera Ocean, the ocean between the Guerrero Terrane and Laurentia * Mirovia, the ocean that surrounded the Rodinia supercontinent * Mongol-Okhotsk Ocean, the early Mesozoic ocean between the North China and Siberia cratons * Oimyakon Ocean, the northernmost part of the Mesozoic Panthalassa Ocean * Paleo-Tethys Ocean, the ocean between Gondwana and the Hunic terranes * Pan-African Ocean, the ocean th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Ocean
The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, although some oceanographers call it the Arctic Mediterranean Sea. It has been described approximately as an estuary of the Atlantic Ocean. It is also seen as the northernmost part of the all-encompassing World Ocean. The Arctic Ocean includes the North Pole region in the middle of the Northern Hemisphere and extends south to about 60°N. The Arctic Ocean is surrounded by Eurasia and North America, and the borders follow topographic features: the Bering Strait on the Pacific side and the Greenland Scotland Ridge on the Atlantic side. It is mostly covered by sea ice throughout the year and almost completely in winter. The Arctic Ocean's surface temperature and salinity vary seasonally as the ice cover melts and freezes; its salinity is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Historical Oceans
History (derived ) is the systematic study and the documentation of the human activity. The time period of event before the invention of writing systems is considered prehistory. "History" is an umbrella term comprising past events as well as the memory, discovery, collection, organization, presentation, and interpretation of these events. Historians seek knowledge of the past using historical sources such as written documents, oral accounts, art and material artifacts, and ecological markers. History is not complete and still has debatable mysteries. History is also an academic discipline which uses narrative to describe, examine, question, and analyze past events, and investigate their patterns of cause and effect. Historians often debate which narrative best explains an event, as well as the significance of different causes and effects. Historians also debate the nature of history as an end in itself, as well as its usefulness to give perspective on the problems of the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous Russia
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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