Exploratorium left a tip at Fort Point National Historic Site

Marine Dr. (at West Bluff Dr.), San Francisco, CA | January 12, 2012
Notice the greenish rock near the entrance. This is serpentinite—California’s state rock—which likely came from deep within the earth’s interior. This rock holds up the south tower of the GG Bridge.
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Fort Point National Historic Site
San Francisco, CA
Historic Site
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