3 ms·
I think you're thinking of Mount Diablo. It's not quite volcanic anymore though (however when California was just the ocean it was), but is instead caused by up
by jdavis703 10y ago
I think you're thinking of Mount Diablo. It's not quite volcanic anymore though (however when California was just the ocean it was), but is instead caused by uplift to the earth's plates: https://en.wikipedia.org/wiki/Mount_Diablo#Geology https://en.wikipedia.org/wiki/Mount_Diablo#Geology.
- jmalicki 10y agoOr possibly Sibley Volcanic Regional Preserve http://www.ebparks.org/parks/sibley.htm http://www.ebparks.org/parks/sibley.htm , which is closer (though not north of) Berkeley.