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Re: [RC] Calif..1st Fires now an earthquake..whats next? Frogs? Locusts? - kathy . mayedaActually, Barbara, you are sitting on top of ocean sediments. Called turbidite sequence - underwater fan shaped depositions coming off of continental shelf. The rounded rocks are probably the Butano Formation, which are lens shaped deposits of coarer sand - and interspersed with areas of finer deposits of clay and silt (eventually forms shale). The shale is most likely the San Lorenzo formation. I was an Earth Science major at UCSC and we spent many a weekend in Santa Cruz Mountains studying the sequences. There are even underwater basalt blubs on Page Mill Road across the San Andreas Fault from ya!
I vaguely remember that it was Jurassic - but I've been out of geology so long that my memory probably is pretty dim. (Ask me how to do electrical design on a Starbucks, though.)
K.
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