http://oaklandgeology.wordpress.com/2007/10/16/piedmont-hill/ focused on, near and under Oakland, California Sat, 18 May 2013 23:16:21 +0000 hourly 1 http://wordpress.com/ http://oaklandgeology.wordpress.com/2007/10/16/piedmont-hill/#comment-2850 Sat, 05 May 2012 21:35:48 +0000 http://oaklandgeology.wordpress.com/2007/10/16/piedmont-hill/#comment-2850 Yes, this kind of ribbon chert is very common in the Alcatraz terrane, in the places you mention.

]]> http://oaklandgeology.wordpress.com/2007/10/16/piedmont-hill/#comment-2846 Fri, 04 May 2012 20:34:51 +0000 http://oaklandgeology.wordpress.com/2007/10/16/piedmont-hill/#comment-2846 This photo looks very similar to stones over by Coit Tower in San Francisco. I’ve also seen similar stones along the Land’s End shoreline.

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