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Southern California Geology

Geologic Setting of the Transverse Ranges Province

San Bernardino Mountains

Geologic Setting East of the San Andreas Fault Zone

Prebatholithic Rocks

Prior to intrusion of the first granitic magmas, pre-batholithic (pre-intrusion) rocks in the San Bernardino Mountains consisted of two packages: (1) very old crystalline rocks that represent the ancient Proterozoic North American continental crust as it existed more than 1.7 billion years ago, and (2) very old sedimentary rocks that were deposited in marine environments that lapped over the ancient Proterozoic continental mass during the Paleozoic and latest Precambrian eras, starting about 900 million years ago.


Table of Contents

Proterozoic Crystalline Rocks
Late Proterozoic and Paleozoic Metasedimentary Rocks
Metaquartzite Sequences
Metacarbonate Sequences
Structure and Metamorphism


Continue to Proterozoic Crystalline Rocks

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This site last updated September 3, 2004 (ps)

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