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Quarry aerial
Steve Edwards with geoogical map
Lava and red ash outcrop
Sibley Panorama
Sibley Preserve Map
KQED Quest Sibley Exploration: Audio slideshow and other materials about Sibley Regional Volcanic Preserve in Oakland.
Voice of the Volcano: We all know that the East Bay hills are ripe for an earthquake, but volcanoes? Don't look for lava in the headlines anytime soon, but there is a place in ...

Bay Nature