California Geologic History

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Cretaceous Forces that created the intrusive granitic rocks ofthe Sierra Nevada and Southern <strong>California</strong>continued episodically until about 90-100 millionyears ago. During the same period sedimentarydeposits were accumulating on the continentalshelf, slope, and in an offshore subduction zone.
Cretaceous By that time the subduction zone had shifted west toabout the current location of the Coast Ranges Deposits in the subduction zone were mixed with rocksfrom the upper mantle beneath the crust producing theFranciscan Formation (extends from northern SantaBarbara to the northern <strong>California</strong> coast). The oceanic crustal material in the Franciscan formationwas thrust up against the Sierran block by about 75million years ago, extending the boundary of the NorthAmerican plate further west.
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 28 and 29: Cenozoic This deposition continued
Page 31 and 32: Cenozoic Volcanic activity, related
Page 39 and 40: The big knot:KillerEarthquakesIn th

California Geologic History

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