http://oaklandgeology.wordpress.com/2010/12/27/northbrae-rhyolite/ focused on, near and under Oakland, California Tue, 18 Jun 2013 17:56:16 +0000 hourly 1 http://wordpress.com/ http://oaklandgeology.wordpress.com/2010/12/27/northbrae-rhyolite/#comment-1720 Wed, 29 Dec 2010 18:16:49 +0000 http://oaklandgeology.wordpress.com/?p=893#comment-1720 Thanks for the link to the Bay Nature article!

]]> http://oaklandgeology.wordpress.com/2010/12/27/northbrae-rhyolite/#comment-1717 Wed, 29 Dec 2010 00:32:53 +0000 http://oaklandgeology.wordpress.com/?p=893#comment-1717 As a rock climber interested in the origin of the things we climb on I have long wondered about Indian Rock. Lots of debate about it among the climbers…We thought volcanic, possibly reworked and indurated chert , or maybe Monterey Formation. I’m talking about 40 years of speculation!
Volcanic made sense because of nearby Mortar Rock being obviously so. Other outcrops in the area look like Indian Rock does, too. For myself, I thought tuff. Guess I was wrong!
Indian Rock bouldering nurtured a generation or two of fine rock climbers who went on to make great ascents in Yosemite and beyond. Thanks Andrew for the update!

]]> http://oaklandgeology.wordpress.com/2010/12/27/northbrae-rhyolite/#comment-1716 Tue, 28 Dec 2010 20:53:06 +0000 http://oaklandgeology.wordpress.com/?p=893#comment-1716 Hi! Bay Nature magazine did an article on our local rocks – have you read it? http://baynature.org/articles/jul-sep-2010/school-of-rock/

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