San Francisquito Formation
The San Francisquito Formation is a geologic formation located in northern Los Angeles County, California, Los Angeles County, California. Seismo.berkeley.edu: Field Guide to the Punchbowl Fault Zone, at Devil's Punchbowl Los Angeles County Park
San Andreas Fault Resources; University of California, Berkeley; by Frederick M. Chester; January 1999.
Department of Earth Sciences, University of California, Riverside; 1982. Areas where it is exposed include: San Francisquito Canyon of the Sierra Pelona Mountains, as well as on the northwestern side of the ...
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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 ...
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