Miocene Volcanic Rocks, Point Dume State Beach, California


ID 202

Lower Miocene volcanic rocks exposed at Point Dume State Beach near Malibu Riviera, Los Angeles County. Point Dume is located at the tip of a triangular peninsula that projects southward into the sea. The Lower Miocene volcanic rocks at the headland were faulted against much softer Upper Miocene marine rocks (not shown). The volcanic rocks are more resistant to wave erosion than the adjacent sedimentary rocks and thus protect the triangular peninsula.

During the whale watching season (approximately mid-December through March), walkers can ascend the marine terrace to a lookout atop Point Dume and observe migrating California gray whales.


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