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Rabbitkettle Formation
The Rabbitkettle Formation is a geologic formation in the Yukon, comprising thin bedded silty and occasionally siliciclastic limestones deposited in deep (below storm wave base) waters. It preserves fossils dating back to the Ordovician period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (or rhetorical period), a concept .... According to it: * Starts in the Late Cambrian; ends in late Tremadoc * reaches 750m in thickness * transitional slope facies * Alternation of black calcareous mudstones and grey, burrowed wackestones See also * List of fossiliferous stratigraphic units in Yukon References * Ordovician Yukon Cambrian northern paleotropical deposits Ordovician northern paleotropical deposits {{Yukon-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yukon
Yukon (; ; formerly called Yukon Territory and also referred to as the Yukon) is the smallest and westernmost of Canada's three territories. It also is the second-least populated province or territory in Canada, with a population of 43,964 as of March 2022. Whitehorse, the territorial capital, is the largest settlement in any of the three territories. Yukon was split from the North-West Territories in 1898 as the Yukon Territory. The federal government's ''Yukon Act'', which received royal assent on March 27, 2002, established Yukon as the territory's official name, though ''Yukon Territory'' is also still popular in usage and Canada Post continues to use the territory's internationally approved postal abbreviation of ''YT''. In 2021, territorial government policy was changed so that “''The'' Yukon” would be recommended for use in official territorial government materials. Though officially bilingual (English and French), the Yukon government also recognizes First Natio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by total area. Its southern and western border with the United States, stretching , is the world's longest binational land border. Canada's capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Indigenous peoples have continuously inhabited what is now Canada for thousands of years. Beginning in the 16th century, British and French expeditions explored and later settled along the Atlantic coast. As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road River Formation
The Road River Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Geologic formations of Alaska Silurian System of North America Ordovician northern paleotropical deposits Silurian northern paleotropical deposits Devonian southern paleotropical deposits {{Silurian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whiterock Formation
Whiterock is a small village in County Down, Northern Ireland. It is within the townland of Killinakin, in the civil parish of Killinchy and historic barony of Dufferin, on the western shore of Strangford Lough, near to the village of Killinchy. It is in the Ards and North Down Borough. It had a population of 355 people (141 households) in the 2011 Census. (2001 Census: 351 people) Whiterock is home to two yacht clubs: Strangford Lough Yacht Club and 1.5 km to the north, Down Cruising Club. The latter is based in a moored former lightship, the ''Petrel'', acquired in 1968. The lightship had been built by the Dublin Dockyard Company in 1915 for the Commissioners of Irish Lights and since registered as a National Historic Ship UK. Between the two yacht clubs is Sketrick Castle, a 15th-century tower house on Sketrick Island, now in ruins. To the south of Whiterock is Ballymorran Bay. See also *List of villages in Northern Ireland This is an alphabetical list of towns an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunblood Formation
The Sunblood Formation is a geologic formation in Northwest Territories. It preserves fossils dating back to the Ordovician period. It comprises dolomite, sandstones and limestones, locally silty (giving rise to a vivid colouration through weathering).http://paleoarchive.com/literature/Bruton1984-07-Barnes-EustaticEventsCanada.pdf See also * List of fossiliferous stratigraphic units in Northwest Territories This is a list of fossiliferous stratigraphic units in the Northwest Territories, Canada. References * {{Lists of fossiliferous stratigraphic units in Canada * Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''N ... References * Ordovician Northwest Territories Ordovician northern paleotropical deposits {{Northwest Territories-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broken Skull Formation
The Broken Skull Formation is a geologic formation in Quebec. It preserves fossils dating back to the Ordovician period. There's another Broken Skull formation in the Mackenzie Mountains of Yukon, dating to the Cambrian-Ordovician, and comprising sandy limestones and dolomites. See also * List of fossiliferous stratigraphic units in Quebec This is a list of fossiliferous stratigraphic units in Quebec, Canada. References * {{Lists of fossiliferous stratigraphic units in Canada Quebec Quebec ( ; )According to the Canadian government, ''Québec'' (with the acute accen ... References * Ordovician Quebec Ordovician northern paleotropical deposits {{Quebec-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sekwi Formation
The Sekwi Formation is a geologic formation in Northwest Territories, Canada, which preserves fossils dating back to the Cambrian period. The formation principally comprises shallow water carbonates, but deepens to include mid-shelf mudstones, both calcareous and siliciclastic. It dates from c. 525-510 Ma, the ''Nevadella'' / ''Bonnia-Olenellus'' trilobite zones. See also * List of fossiliferous stratigraphic units in Northwest Territories This is a list of fossiliferous stratigraphic units in the Northwest Territories, Canada. References * {{Lists of fossiliferous stratigraphic units in Canada * Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''N ... References * Cambrian Northwest Territories Cambrian southern paleotropical deposits {{Northwest Territories-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (geology)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Union of Geological Sciences, Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Period (geology)
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardized international units of geologic time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely define ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
