Did you know that Mt. Diablo was volcanic rock beneath the surface of the Pacific Ocean some 165 million years ago? It wasn't until some 2 million years ago that the peaks became exposed as low lying hills.
A reprint of the Fall 2000 edition of Mount Diablo Review is available as interesting reading on the history of Mt. Diablo including early human and more recent Indian habitation. Check it out - click here to see that reprint.
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