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             Devil's Postpile National Monument, 
Reached from Mommoth Lakes Calif., this national monument is a fascinathing basaltic lava flow formation. This flow occurred about 915,000 years ago and was succeeded glacial advances which removed on side of the Postpile. The remaning 4, 5 and 6 sided colums are from 30 to 50 feet long high.  On the top of the postpile may be seen a  Natural Mosaic created by erosion  of the passing glacial ice.