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Geology of northwestern Baja California, Field Trip no. 5

Allen, Clarence R. and Allison, Edwin C. and Roberts, Ellis R. and Silver, Leon T. (1961) Geology of northwestern Baja California, Field Trip no. 5. In: Guidebook for field trips meeting at San Diego State. San Diego State College , San Diego, CA, pp. 56-65.

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This trip will offer an opportunity to examine the coastal segment of the Peninsular Range Province in an area of Baja California where the stratigraphic and tectonic history of the province is far clearer than in the more highly deformed areas north of the international border. Three major rock units characterize this province: (1) pre-batholithic eugeosynclinal accumulations of volcanic and sedimentary rocks, in part metamorphosed; (2) plutonic rocks of the batholith of southern and Baja California (the Peninsular batholith); and (3) Post-batholithic sedimentary and volcanic rocks of Upper Cretaceous and Cenozoic age. In general, the high "backbone" of Baja California is underlain by massive batholithic rocks, whereas the foothills between the high ranges and the Pacific coast are underlain by pre-batholithic volcanic, sedimentary and metamorphic rocks. The pre-batholithic rocks have been intruded by plutons that decrease in size and abundance toward the west. Relatively unmetamorphosed prebatholithic rocks and batholithic rocks are truncated and overlain by Upper Cretaceous and Cenozoic rocks in a thin strip along the Pacific coast. Inasmuch as this trip is limited primarily to the coastal area, the batholithic rocks will be examined only in some of these smaller plutons, but the pre- and post-batholithic rocks exposed in this coastal strip are among the most revealing that are present anywhere within the Peninsular Range province.

Item Type:Book Section
Alternate Title:A geologic guide to selected localities along Mexico Highway 1, Punta Banda, and the lower Santo Tomas Valley
Additional Information:© 1961 San Diego State College.
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Caltech Division of Geological Sciences1022
Record Number:CaltechAUTHORS:20220804-173708865
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116095
Deposited By: Tony Diaz
Deposited On:04 Aug 2022 17:52
Last Modified:04 Aug 2022 17:52

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