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Cedar District Formation
The Cedar District Formation is a Formation (geology), geologic formation exposed on Vancouver Island, the Gulf Islands of British Columbia and San Juan Islands of Washington (state). It preserves fossils dating back to the Campanian Epoch (geology), Epoch of the Cretaceous Period (geology), period. It dates to the lower mid-Campanian. Paleobiology Flora *''Suciacarpa starrii'' Fauna *''Baculites, Baculites rex'' *''Baculites, Baculites anceps'' *''Baculites, Baculites occidentalis'' *''Baculites, Baculites inornatus'' *''Anapachydiscus, Anapachydiscus nelchinensis'' *''Metaplacenticeras'' sp. *''Canadoceras, Canadoceras newberryanum'' *''Pachydiscus, Pachydiscus neevesi'' *''Hoplitoplacenticeras, Hoplitoplacenticeras vancouverense'' *''Gaudryceras, Gaudryceras denmanense'' *''Neophylloceras'' sp. *''Condonella, Condonella suciensis'' *Ornithomimidae indet. *Theropoda indet. (possibly Tyrannosauridae) See also * List of fossiliferous stratigraphic units in Washington (state) ... [...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] |
