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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 (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] |
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 The Bromide Formation is a geological formation in Oklahoma, USA. It is well known for its diverse echinoderm and trilobite fossil fauna. Location The Bromide Formation crops out in the Arbuckle and Wichita Mountains and in the Criner Hills ...), Vermont and Wyoming. ''C. horridus'' has been recovered from the Blakely Sandstone and ''C. angulatus'' from the Collier Shale, Ordovician geologic formations in the Ouachita Mountains of Arkansas and Oklahoma. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
