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Gamoneda Formation
The Gamoneda Formation is an Emsian geologic Formation (geology), formation of southern Bolivia. The approximately thick formation comprises marine micaceous grey siltstones and burrowed grey sandstones and shales. at Fossilworks.org Fossil content The formation has provided the following fossils: * ''Acastoides, Acastoides gamonedensis'' * ''Australocoelia, Australocoelia palmata'' * ''Australospirifer, Australospirifer hawkinsi'' * ''Australostrophia, Australostrophia mesembria'' * ''Bainella, Bainella (Belenops) insolita'' * ''Cryptonella, Cryptonella baini'' * ''Deltacephalaspis, Deltacephalaspis (Deltacephalaspis) comis'' * ''Deltacephalaspis, Deltacephalaspis (Deltacephalaspis) retrospina'' * ''Deltacephalaspis, D ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
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 Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
