Miocene deepwater diatomite exposed at Gaviota CA. Rich in organic matter, these rocks expulse oil naturally, tar blob at left in foreground http://pic.twitter.com/aK5YqUQQeW
— off the shelf edge (@ZaneJobe) May 19, 2017
via Twitter https://twitter.com/ZaneJobe
May 20, 2017 at 05:02AM
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