Geology of a Portion of the Southeast Quarter of the Tejon Quadrangle, Los Angeles County, California

Citation

Clements, Thomas (1929) Geology of a Portion of the Southeast Quarter of the Tejon Quadrangle, Los Angeles County, California. Master's thesis, California Institute of Technology. doi:10.7907/S6H4-QA15. https://resolver.caltech.edu/CaltechTHESIS:01042010-091125453

Abstract

In this area of some thirty-eight square miles in the southeast corner of the Tejon Quadrangle, are exposed igneous, metamorphic and sedimentary rocks. The metamorphics are mainly schists derived from former sediments, and Pre-Jurassic in age. The sedimentary rocks occupy the principal part of the area and represent deposition in Martinez, Sespe, Mint Canyon, Modelo, Saugus and Quaternary times. The igneous rock is an isolated remnant of acidic lava probably of Miocene age.

Three prominent faults are found in and immediately adjacent to the area; the San Francisquito, partly overthrust, partly normal in character; the Bee Canyon Fault, normal; and the fault just north of the area, which is also normal. Some folding occurs, probably related to the faulting.

Perhaps the two most important facts brought out by the study are the apparently lateral and upward grading of non-marine Mint Canyon sediments into marine Modelo, and the overthrust nature of the San Francisquito Fault in the canyon of the same name.

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