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How deep is the sand in the Pismo-Guadalupe Dunes and what lies beneath it?

April 26, 2017beneath Deep dunes lies pismo-guadalupe Sand

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How deep is the sand in the Pismo-Guadalupe Dunes and what lies beneath it?

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Although the tallest dunes are about 160 feet in elevation, most of the dunes are about 100 feet high. The dunes have accumulated on former valley surfaces (at or just above sea-level) and are underlain by mostly stream alluvium. Thus, the dunes are approximately 100 feet thick.