Age estimates based on uranium and thorium isotopes in invertebrate skeletal material from marine terrace deposits at Cayucos, California, range from 130,000 to 140,000 years B.P. This age range suggests that the Cayucan (central California) invertebrate shelf province was contemporaneous with the Verdean (southern California) shelf province. Both provinces were probably chiefly Sangamonian but may have persisted into early Wisconsin time.

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