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Science 21 April 1967:
Vol. 156. no. 3773, p. 379
DOI: 10.1126/science.156.3773.379
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Articles

Vertebrate Evidence of a Low Sea Level in the Middle Pliocene

S. David Webb 1 and Norman Tessman 1

1 Florida State Museum, University of Florida, Gainesville 32601

Marine and untransported terrestrial vertebrates of Middle Pliocene (Hemphillian) age occur together in well-sorted, sandy, phosphatic gravels at an elevation of 1.8 to 3 meters in Manatee County, Florida. If no crustal warping of the Late Cenozoic age has occurred in this part of Florida (as investigators generally agree), the sea must have approached its present level 4 to 7 million years ago.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)