- Stock Photography: GREYWACKE ROCK WITH LICHEN AND WILD GRASS ON MT DAVIDSON SAN FRANCISCO, 2. by Peachpappa
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- Photo title: Greywacke rock with lichen and wild grass on Mt Davidson San Francisco, 2.
- Author: Peachpappa
- Cover photo description:
- 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.
- Image ID:119002996
- Views:4
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