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Abstract: Late Miocene Glacio-Eustatic Lowering of Sea Level--Evidence from Choctawhatchee Formation, Florida Panhandle

Previous HitPaulTop F. Huddlestun, Ramil C. Wright

The Choctawhatchee Formation of the Florida Panhandle consists of fossiliferous marlstones and argillaceous sandstones which were deposited in an inner neritic environment undergoing progradation. The planktonic foraminiferal assemblages in this rock unit indicate that the sediments were deposited at the time of deposition of Zone N-17 (Miocene).

Detailed lithologic and micropaleontologic analyses of the Choctawhatchee indicate that a marked regression occurred near the end of the late Miocene. This regression seems to correlate with similar events recorded on the West Coast and in the southeastern United States, with the late Miocene period of glaciation recorded in Antarctic deep-sea cores, and with the isolation of the Mediterranean at the onset of the Messinian salinity crisis. A glacio-eustatic lowering of sea level is the probable cause of these widespread regressions.

AAPG Search and Discovery Article #90967©1977 GCAGS and GC Section SEPM 27th Annual Meeting, Austin, Texas