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Fernvale Limestone
The Fernvale Limestone is a geologic formation in Alabama, Arkansas, Illinois, Missouri, Oklahoma, and Tennessee. It preserves fossils dating back to the Ordovician period. Paleontology Brachiopods *'' Lepidocyclus'' :''L. cooperi'' :''L. oblongus'' Conodonts * ''Acodus'' : ''A. unicostatus'' * '' Acontiodus'' : ''A. alveolaris'' * '' Ambalodus'' : ''A. triangularis'' * '' Amorphognatus'' : ''A. ordovicica'' * '' Aphelognathus'' : ''A. polita'' * '' Belodina'' : ''B. compressa'' : ''B. inclinata'' : ''B. ornata'' : ''B. penna'' : ''B. profunda'' * '' Cordylodus'' : ''C. delicatus'' : ''C. flexuosus'' * '' Dichognathus'' : ''D. brevis'' : ''D. scotti'' : ''D. typica'' * '' Distacodus'' : ''D. falcatus'' * '' Drepanodus'' : ''D. homocurvatus'' : ''D. suberectus'' * '' Eoligonodina'' : ''E. delicata'' * '' Icriodella'' : ''I. superba'' * '' Keislognathus'' : ''K. gracilis'' * '' Oistodus'' : ''O. abundans'' : ''O. inclinatus'' : ''O. parallelus'' : ''O. venustus'' * '' Ozar ... [...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] |
Cordylodus
''Cordylodus'' is an extinct genus of conodonts in the family of Cordylodontidae. Use in stratigraphy It is suggested that ''Cordylodus andresi'' can be a marker of the Cambrian Stage 10. Distribution Fossils of ''Cordylodus'' have been found in Argentina, Australia, Canada (Quebec), China, Colombia ( Tarqui, Huila),Moreno et al., 2008, p.10 Kazakhstan, Malaysia, Mexico, Norway, the Russian Federation, Sweden, and the United States, in the states of Alaska, Minnesota, Nevada, New York, Oklahoma ( Bromide Formation), Vermont and Wyoming. ''C. horridus'' has been recovered from the Blakely Sandstone The Blakely Sandstone is a Middle Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892, this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkans ... and ''C. angulatus'' from the Collier Shale, Ordovician geologic formations in the Ouachita Mountains of Arkansas and Oklaho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
