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Pennington Formation
The Pennington Formation is a geologic formation named for Pennington Gap, Virginia.Butts, Charles. Geology and Oil Possibilities of the Northern Part of Overton County, Tenn., and of Adjoining Parts of Clay, Pickett and Fentress Counties', pp. 25-26 (Williams Printing 1919). It can be found in outcrops along Pine Mountain and Cumberland Mountain in Kentucky, Virginia, and Tennessee, where it is the uppermost Mississippian-age formation. The name has also been applied to similar Mississippian strata in the Cumberland Escarpment of eastern Kentucky, though the rocks in that area were later renamed to the Paragon Formation.Ettensohn, Frank et al."Slade and Paragon Formations — New Stratigraphic Nomenclature for Mississippian Rocks Along the Cumberland Escarpment in Kentucky" ''U.S. Geological Survey Bulletin 1605-B'', p. 4 (1984). According to general usage among geologists, the Pennington Formation corresponds to shales, sandstones, and thin limestone beds located above the ... [...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] |
