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Turlock Lake Formation
The Turlock Lake Formation is an Early Pleistocene geologic formation in the Sierra Nevada (U.S.), Sierra Nevada foothills in Sacramento County, California. Cities in/over the formation's area include Citrus Heights, California, Citrus Heights, Carmichael, California, Carmichael, and Roseville, California, Roseville. The Turlock Lake Formation is a fan deposit of dominantly granitic alluvium covering the westward extension of the North Merced Pediment and Gravels formation, and directly overlying the Mehrten Formation. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic 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] |
