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Sea-level records at 80 ka from tectonically stable platforms: Florida and Bermuda

¹ U.S. Geological Survey, MS 963, Box 25046, Federal Center, Denver, Colorado 80225
² U.S. Geological Survey, Center for Coastal Geology, 600 4th Street South, St. Petersburg, Florida 33701

Studies from tectonically active coasts on New Guinea and Barbados have suggested that sea level at 80 ka was significantly lower than present, whereas data from the Atlantic and Pacific coasts of North America indicate an 80 ka sea level close to that of the present. We determined ages of corals from a shallow submerged reef off the Florida Keys and an emergent marine deposit on Bermuda. Both localities are on tectonically stable platforms distant from plate boundaries. Uranium-series ages show that corals at both localities grew during the 80 ka sea-level highstand, and geologic data show that sea level at that time was no lower than 7–9 m below present (Florida) and may have been 1–2 m above present (Bermuda). The ice-volume discrepancy of the 80 ka sea-level estimates is greater than the volume of the Greenland or West Antarctic ice sheets. Comparison of our ages with high-latitude insolation values indicates that the sea-level stand near the present at 80 ka could have been orbitally forced.

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