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Re: [RC] Calif..1st Fires now an earthquake..whats next? Frogs? Locusts? - kathy . mayeda

Actually, 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.)
-------------- Original message --------------
From: "Barbara McCrary" <bigcreekranch@xxxxxxxxxxxx>
Our shale ridges at 1600 - 2000 ft. elevation are made of mud sediment.  Also, we know of a ridge at probably 1400-1600 ft. elevation that has rounded rocks.  A local man, a geology expert, told my husband that those rocks were once in a river and that gold was found there.  Fascinating.....
----- Original Message -----
To: Susan
Sent: Wednesday, October 31, 2007 9:02 AM
Subject: Re: [RC] Calif..1st Fires now an earthquake..whats next? Frogs? Locusts?

And our SoCal coastal mountain ranges are pocked with dolomite beds and ocean fossils indicating the area was once (Pleistocene era?) under water. It's dynamic.

Lynn Kinsky, Santa Ynez, CA