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Stop 19, Spring Garden Serpentinite: The Setting

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Stop 19 is at 39°54.978´N, 120°49.542´W east of Quincy, exposing the Sierra's oldest ophiolite. (more below)
Oldest and darkest of its tribe
Photo (c) 2006 Andrew Alden, licensed to About.com (fair use policy)
This is the oldest body of ophiolitic rocks in the Sierra Nevada; a related granite is dated at 500 Ma, during the Cambrian Period. It also happens to be the darkest serpentinite I came across in the field trip. It is thrusted over rocks belonging to the Shoo Fly Complex (stop 17), or rather they are thrusted beneath it. This is a typical subduction-related pattern that should be familiar by this time.

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

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