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Stop 13, Deformed Gabbro of the Jarbo Gap Ophiolite: The Setting

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Stop 13 is at 39°46.842´N, 121°27.098´W on a narrow, winding road overlooking the North Fork Feather River. (more below)
The deeper stuff
Photo (c) Andrew Alden, licensed to About.com (fair use policy)
Gabbro is the same rock as basalt, only with larger grains because it cooled more slowly in a plutonic rather than extrusive setting. Like the rocks at stop 12, these ophiolite rocks have been deformed and distorted during their travels to the California subduction zone during the Jurassic. It is postulated that these too were in or near an oceanic fracture zone.

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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