A bluff on the eastern coast of Mexico reveals a cross section through an ancient beach deposit now lying 4 meters above sea level. Radio-carbon dates on the shells within the deposit reveal an age of 1940 years. The deposit appears to be valid evidence for submergence greater than that of the present, but whether that submergence was due to a higher eustatic stand of the sea or whether there has been an uplift of the land since that time cannot yet be determined.
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E. William Behrens (1966) studied this question.
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