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California Subduction Rocks

From Andrew Alden, About.com

Take this photographic field trip to classic subduction-related rocks across northern California. See image 1 for an introduction. California is considered a key locality for seeing and understanding rocks that come from all parts of subduction zones. Here are quick links to all the stops:

Day 1, Coast Range: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

Day 2, Sierra Nevada: 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18

Day 3, Sierra Nevada: 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28

Day 4, Coast Range: 29 | 30 | 31 | 32 | 33

Images 1-12 of 116

Study this before you startSchematic of SubductionGross geology of CaliforniaKey Map of GeologyWith stops markedMap of Stops, Days 1 and 4With stops markedMap of Stops, Days 2 and 3
Red chert displayed to perfectionStop 1, Marin Headlands—The SettingOverlooking Kirby CoveStop 1, Marin Headlands: The Golden GateA classic roadcutStop 1, Marin Headlands: Radiolarian ChertThrust faultingStop 1, Marin Headlands: Nappe Thrusts
A postcard pictureStop 1, Marin Headlands: Red Chert DeformationHigh-grade blocksStop 2, Ring Mountain PreserveA field of knockersStop 2, Ring Mountain Preserve: Tamalpais VistaAltered basalt knockerStop 2, Ring Mountain Preserve: Greenstone
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