San Diego Formation

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The San Diego Formation is a mostly sand, with rock layer from a former bay of San Diego of late Pliocene age.

Besides clams, and other mollusks, a fossil of the forerunner to the Cassin's Auklet has been found.

[edit] External links

• "Clams of Champions" article from "San Diego Formation"
• San Diego County Water Authority - Water Management - Local Resources