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Pitkin Formation
The Pitkin Formation, or Pitkin Limestone, is a fossiliferous Formation (geology), geologic formation in northern Arkansas that dates to the Chesterian, Chesterian Series of the late Mississippian (geology), Mississippian. This formation was first named the "Archimedes Limestone" by David Dale Owen in 1858, but was replaced in 1904. The Pitkin conformably overlies the Fayetteville Shale and unconformably underlies the Pennsylvanian (geology), Pennsylvanian-age Hale Formation. Some workers have considered the shales at the top of the Pitkin Formation to be a separate formation called the Imo Formation. More recently, others have considered the Imo to be informal member of the Pitkin Formation. Paleofauna Early work aimed at creating a comprehensive list for all fossils found in the Pitkin Formation was done by Easton in 1943. Unless otherwise stated, all species below can be found in his 'Fauna of the Pitkin Formation.' Formanifera *''Archaediscus'' :''A. stilus'' *''Asteroarchae ... [...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] |
Fayetteville Shale
The Fayetteville Shale is a geologic formation (geology), formation of Mississippian age (354–323 million years ago) composed of tight shale within the Arkoma Basin of Arkansas and Oklahoma. It is named for the city of Fayetteville, Arkansas, and requires hydraulic fracturing to release the natural gas contained within. Nomenclature Named by Frederick Willard Simonds in 1891, Simonds recognized what is now the Fayetteville Shale as three separate formations overlying the now abandoned Wyman Sandstone: the Fayetteville Shale, the Batesville Sandstone, and the Marshall Shale. In 1904, the name "Fayetteville Shale" replaced all three of these names. The Fayetteville Shale that Simonds recognized is now considered as the lower Fayetteville Shale. Simonds' Batesville Sandstone was found to be the same as the Wyman Sandstone, and replaced the name "Wyman Sandstone", while Simonds' Batesville Sandstone became known as the "Wedington Sandstone Member" presumably after Wedington Mountai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eostaffella
''Eostaffella'' is an extinct genus of fusulinid belonging to the family Eostaffellidae. Specimens of the genus have been found in Carboniferous to Permian The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years, from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the s ... beds in Europe, Asia, and North America. Species *''E. acuta'' Grozdilova and Lebedeva 1950 *''E. donbassica'' Kireeva 1949 *''E. galinae'' Ganelina 1956 *''E. irenae'' Ganelina 1956 *''E. lepida'' Grozdilova and Lebedeva 1950 *''E. mosquensis'' Vissarionova 1948 *''E. pinguis'' Thompson 1944 *''E. postmosquensis'' Kireeva 1951 *''E. serotina'' Leven 1992 References Paleozoic life Fusulinida Radiolarian genera {{Foram-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endothyra
''Endothyra'' is an extinct genus of fusulinid belonging to the family Endothyridae. Specimens of the genus have been found in Carboniferous The Carboniferous ( ) is a Geologic time scale, geologic period and System (stratigraphy), system of the Paleozoic era (geology), era that spans 60 million years, from the end of the Devonian Period Ma (million years ago) to the beginning of the ... beds in North America and many other locations in the world. It was a common and widespread rock-forming fusulinid. Species *''E. baileyi'' *''E. bowmani'' Phillips 1846 References Paleozoic life Fusulinida Radiolarian genera {{Foram-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earlandia
''Earlandia'' was a genus of prehistoric foraminifera. See also * Arthur Earland (1866–1958), a British oceanographer, microscopist and expert on Foraminifera * List of prehistoric foraminifera genera References External links * ''Earlandia''at WoRMS ''Earlandia''at fossilworks Prehistoric Foraminifera genera Fusulinida Radiolarian genera {{foram-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
