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Attawapiskat Formation
The Attawapiskat Formation is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period. Location The Attawapiskat Formation encompasses a large portion of the Hudson Bay Basin. The formation remains visible from northern Ontario. A small portion of the formation does extend onto Nunavut territory. Composition It is widely believed that the formation originally deposited on a shallow rimmed shelf, followed by the development of barrier reefs into an nonlinear and uncoordinated "belt" around the Hudson Basin. Within the Hudson Bay Lowlands, the formation consists of dolomite and limestone rich in both coral and sponge. The formation is a haven for lithotopes, or media for sediments to deposit, with various types including: * Mottled to Nodular Skeletal Wackestone * Stromatoporoid-Coral Framestone * Pelodial Intraclastic Bindstone * Graded Oolitic Grainstone The formation's depth reaches 62 meters at its deepest. Fossil content See also * Lis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
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] |
Meristina
''Meristina'' is an extinct genus of brachiopods that lived from the Late Ordovician to the Middle Devonian of Asia, Europe, and North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car .... ''Meristina'' had a smooth convex shell with a one-inch diameter. Sources * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 85) External links''Meristina''in the Paleobiology Database Spiriferida Prehistoric brachiopod genera Ordovician brachiopods Silurian brachiopods Devonian brachiopods Paleozoic animals of Asia Prehistoric animals of Europe Paleozoic brachiopods of North America Late Ordovician first appearances Middle Devonian genus extinctions Paleozoic life of Ontario Paleozoic life of British Columbia Paleozoic life of Manitoba Paleozoic life of New ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sclerite
A sclerite (Greek , ', meaning "hard") is a hardened body part. In various branches of biology the term is applied to various structures, but not as a rule to vertebrate anatomical features such as bones and teeth. Instead it refers most commonly to the hardened parts of arthropod exoskeletons and the internal spicules of invertebrates such as certain sponges and soft corals. In paleontology, a scleritome is the complete set of sclerites of an organism, often all that is known from fossil invertebrates. Sclerites in combination Sclerites may occur practically isolated in an organism, such as the sting of a cone shell. Also, they can be more or less scattered, such as tufts of defensive sharp, mineralised bristles as in many marine Polychaetes. Or, they can occur as structured, but unconnected or loosely connected arrays, such as the mineral "teeth" in the radula of many Mollusca, the valves of Chitons, the beak of Cephalopod, or the articulated exoskeletons of Arthropoda. When ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Severn River (Hudson Bay)
The Severn River is a river in northern Ontario. The northern Ontario river has its headwaters near the western border of the province. From the head of the Black Birch River, the Severn River is long, Its drainage basin area is , a small portion of which is in Manitoba. Its source is Deer Lake and flows northeasterly into Severn Lake, then by a second section to Hudson Bay where it ends at Fort Severn. The First Nation communities of Sandy Lake, Bearskin Lake, and Fort Severn are located along the river. These were formed at the sites of former trading posts built when the Severn River was a prominent river during the fur trade era. Located at the mouth of the river, Fort Severn was established as a trading post in 1689 by the Hudson's Bay Company. It was captured by Pierre le Moyne, sieur d'Iberville in 1690. The post, rebuilt in 1759, has been in continuous operation to this day making this community one of the oldest European settlements in Ontario. At its source on D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiozoon
''Chiozoon'' is a cheirurid phacopid trilobite that existed during the lower Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ... of what is now northeastern Greenland.Lane, P. D. "New trilobites from the Silurian of Northeast Greenland, with a note on a trilobite faunas in pure limestones." Palaeontology 15 (1972): 336-364. It was described by Philip D. Lane in 1972, and the type species is ''Chiozoon cowiei''. P. A. Jell & J. M. Adrain. References External links [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acidaspis
''Acidaspis'' is an extinct genus of odontopleurid trilobite from the Ordovician to Silurian of North America and Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia .... Although small, it had long spines along its body. Reassigned species *''Acidaspis emarginata'' = '' Anabaraspis emarginata'' References Odontopleuridae Odontopleurida genera Ordovician trilobites of North America Silurian trilobites of Europe Silurian trilobites of North America Paleontology in Ohio Paleontology in New York (state) Paleozoic life of Ontario Paleozoic life of the Northwest Territories Paleozoic life of Nunavut Paleozoic life of Quebec {{Odontopleurida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reticularia Brachiopod , Chlorophyta, Plantae)
{{genus disambiguation ...
Reticularia may refer to: * ''Reticularia'' (protist) Bull., 1788, a genus of protists * ''Reticularia'' Baumg., 1790, nom. illeg., synonym of ''Lobaria'' (Lobariaceae, Fungi) * ''Reticularia'' (brachiopod) M'Coy, 1844, a genus of Paleozoic Brachiopoda (Silurian to Permian) * ''Reticularia'' Carpenter, 1861, 1862, synonym of '' Foraminifera'' (Rhizaria, Chromista) * ''Reticularia'' M.O.P.Iyengar, 1975, nom. illeg., replaced by '' Ecballodictyon'' (Palmellaceae The Palmellaceae are a family (biology), family of green algae, specifically of the Chlamydomonadales. References External links Scientific references Scientific databases Chlorophyceae families Chlamydomonadales {{Chlorophyceae-stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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