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October 21, 1861: San Ramon

October 21, 2011

Rock City 06

Sandstone formation at Rock City, Mount Diablo State Park; by Tom Hilton, on Flickr

Camp 52

Today Hoffmann and I have been up about eight or ten miles on the ridges at the foot of Mount Diablo. We passed over the edges of perpendicular strata, standing perfectly on edge, for two or three miles, showing that these strata have that enormous thickness. They contain shells in abundance at intervals through the whole of that immense thickness—oyster, clam, and other shells. We were on a ridge over two thousand feet high, with these shells on the top and in the rock. Last week we were on a ridge 2,200 feet high, where wagon loads of immense oyster shells might be picked up. Today I found also the joint of a whale’s backbone! These are some of the marvels of Californian geology.

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