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The San Joaquin Formation is a Pliocene epoch geologic formation in the lower half of the San Joaquin Valley in central California .
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1-778: With the underlying Etchegoin Formation , it is associated with the numerous oil fields in the central and southern San Joaquin Valley. It is overlaid by the Tulare Formation . It preserves fossils dating back to the Neogene period of the Cenozoic Era. This article about a specific stratigraphic formation in California is a stub . You can help Misplaced Pages by expanding it . This article related to