greywacke rock heaves davidson san francisco |
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navigate by keyword : all are avalanches causing characteristics davidson different form francisco franciscos get greywacke heaves highest hills mixed much natural one only patters point produced recently rippled rock rocks san sediment that this together top types understood underwater unusual was ways |
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Much of San Francisco`s hills rocks are Greywacke, a form of rock that was only recently understood. It is produced by underwater avalanches, causing different types of sediment to get all mixed together in unusual ways. The rippled patters on the rock is one of the characteristics. This is the top of Mt. Davidson, the highest natural point in San Francisco is 977 feet. |
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