Roadcut on The Old Road north of Calgrove Blvd. near the contact between the Pliocene Pico Formation that was deposited in shallow ocean water and the younger Plio-Pleistocene Saugus Formation that was deposited by rivers on land. During the time of deposition the shoreline was migrating back and forth so that some of the rocks in this exposure were deposited in very shallow ocean water and others were deposited above the beach on land.
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