Berkeley’s Rock Parks By Susan Schwartz, President, Friends of Five Creeks Geology: About 11.5 million years ago, volcanoes somewhere south of today’s San Jose erupted thick lavas rich in silica, called rhyolites. Th

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Date: 2011-11-27 22:21:26 Albany California Berkeley California Yosemite National Park Duncan McDuffie Friends of Five Creeks Berkeley Rose Garden Geography of California California Sierra Club		Berkeley’s Rock Parks By Susan Schwartz, President, Friends of Five Creeks Geology: About 11.5 million years ago, volcanoes somewhere south of today’s San Jose erupted thick lavas rich in silica, called rhyolites. Th Add to Reading List Source URL: www.fivecreeks.org Download Document from Source Website File Size: 127,51 KB Share Document on Facebook

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