California Geologic History

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Cenozoic This deposition continued without interruptionuntil around 40 million years ago. Over the next10 million years the coast shifted back and forth,producing a patchwork of marine and nonmarinesedimentary rocks in the Coast Rangesand western Transverse Ranges.
Cenozoic 25-29 million years ago. The oceanic plate that hadbeen subducting beneath the western edge of NorthAmerica became completely overridden, starting in thesouth, and the North American and Pacific plates cameinto direct contact for the first time. Tangential motion and expansion replaced convergentmotion as the North American plate began interactingwith the Pacific plate. The San Andreas Fault system was formed. In far northern <strong>California</strong> and the Pacific Northwest,north of the Mendocino triple junction, convergentmotion has continued right up to present times.
Page 1: California Geologic History
Page 4: Alabama Hills
Page 10: Proterozoic and Paleozoic Era All o
Page 13: Antler and Sonoma Events Around 400
Page 19: Mesozoic Era 245-65 mya By 150 mill
Page 23: Cretaceous By that time the subduct
Page 31 and 32: Cenozoic Volcanic activity, related
Page 39 and 40: The big knot:KillerEarthquakesIn th

California Geologic History

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