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Hale Formation
The Hale Formation is a Formation (geology), geologic formation in northern Arkansas that dates to the Pennsylvanian (geology)#Subdivisions, Morrowan Series of the early Pennsylvanian (geology), Pennsylvanian.Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014. The Hale Formation has two named members: the Cane Hill and the Prairie Grove Members. The lower member is the Cane Hill, a primarily sandstone and shale interval that unconformably overlies the Mississippian (geology), Mississippian-age Pitkin Formation. The upper member, the Prairie Grove Member, is predominately limestone and conformably underlies the Bloyd Formation. Nomenclature Named by J. A. Taff in 1905, the Hale Formation was originally called the "Hale sandstone lentil" of the Morrow Formation after Hale Mountain in Washington County, Arkansas, Washington County, Arkansas. In the same year, George I ... [...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 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 W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentremites
''Pentremites'' is an extinct genus of blastoid echinoderm belonging to the family Pentremitidae. Description These stalked echinoderms averaged a height of about but occasionally ranged up to about 3 times that size. They, like other blastoids, superficially resemble their distant relatives, the crinoids or ''sea lilies'', having a near-identical, planktivore, planktivorous lifestyle living on the sea floor attached by a stalk. As with all other blastoids, species of ''Pentremites'' trapped food floating in the currents by means of tentacle-like appendages. ''Pentremites'' species lived in the early to middle Carboniferous, from 360.7 to 314.6 Ma. Its fossils are known from North America. References * ''Fossils'' (Smithsonian Handbooks) by David Ward (paleontologist), David Ward (Page 190) Blastozoa genera Carboniferous echinoderms of North America Fossils of Georgia (U.S. state) Paleozoic life of Alberta Paleozoic life of the Northwest Territories Paleozoic life of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linoproductus
''Linoproductus'' is an extinct genus of brachiopod belonging to the order Productida and family Linoproductidae. Specimens have been found in Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carbonifero ... to Permian beds in Asia, North America, and South America. Species *''L. antonioi'' Verna and Angiolini 2011 *''L. caima'' Chen ''et al.'' 2004 *''L. cora'' d'Orbigny 1842 *''L. delawarii'' Marcou 1858 *''L. kharaulakhensis'' Fredericks 1915 *''L. lineatus'' Waagen 1884 *''L. prattenianus'' Norwood and Pratten 1855 *''L. simensis'' Tschernyschew 1902 *''L. tenuistriatus'' de Verneuil 1845 References Paleozoic life Productida {{Brachiopod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinaria (brachiopod)
''Echinaria'' is an extinct genus of brachiopods which lived during the Upper Carboniferous and Lower Permian periods. Its fossils have been found in Eurasia, North America and northern South America. Description Like other echinoconchids, ''Echinaria'' had thin, recumbent spines arranged in concentric bands on both valves, as well as a corpus with a planoconvex profile and deep cavity. Members of this genus had cardinal ridges and an elongated outline which widened anteriorly. ''Echinaria'' are medium to large-sized echinoconchids, and while notably larger than ''Echinoconchus ''Echinoconchus'' is an extinct genus of brachiopods which lived during the Lower Carboniferous period. The genus was abundant and had a cosmopolitan distribution. Description Like other echinoconchids, ''Echinoconchus'' had thin, recumbent spin ...'', many similarities are observed between the two genera and they are placed in the same subfamily. Classification Leighton & Maples (2002) conducted m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composita
''Composita'' is an extinct brachiopod genus that lived from the Late Devonian to the Late Permian.''Composita'' at .org ''Composita'' had a cosmopolitan global distribution, having lived on every except . [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beecheria
''Beecheria'' is an extinct genus of brachiopod belonging to the order Terebratulida and family Beecheriidae. Fossils of this genus have been found in Mississippian (geology), Mississippian to Permian beds in Eurasia, Australia, North America, and South America. The genus was part of the ''Levipustula'' fauna characteristic of cold water conditions. "Nests" of ''Beecheria'' have been found in fossil low temperature hydrothermal vent communities from the early Carboniferous in Newfoundland. Species *''B. angusta'' Netschajew 1894 *''B. boranelensis'' Peou and Engel 1979 *''B. chouteauensis'' Weller 1914 *''B. curva'' Smirnova 2009 *''B. elliptica'' Cooper and Grant 1976 *''B. expansa'' Cooper and Grant 1976 *''B. kargaliensis'' Smirnova 2007 *''B. lidarensis'' Diener 1915 *''B. magna'' Jin and Ye 1979 *''B. netschajewi'' Grigor'yeva 1967 *''B. samarica'' Smirnova 2007 References Paleozoic life Spiriferida {{Brachiopod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
