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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 51 (1967)

Issue: 10. (October)

First Page: 2162

Last Page: 2163

Title: Marine and Terrestrial Pliocene and Pleistocene Deposits of Florida: ABSTRACT

Author(s): H. K. Brooks, C. V. Conklin

Article Type: Meeting abstract

Abstract:

For the first time fossiliferous marine, estuarine, and terrestrial deposits of peninsular Florida are correlated and are related to topographic terraces. Synthesis of all data reliably proves a middle to late Pliocene

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stand of sea level at 120-140 ft altitude, an Aftonian stand at 90-100 ft, a Yarmouthian stand at 40-70 ft, and a Sangamonian stand at about 25 ft.

The classic exposures of the Fort Thompson and Caloosahatchee Formations on the Caloosahatchee River are the best sections for correlation. Cooke's four marine units in the Plio-Pleistocene sequence are confirmed by detailed tracing of fossiliferous beds, fresh-water marl, and caliche crust related to unconformities. Faunas in the four marine beds show distinct biostratigraphic and paleoecological trends. The ratio of extinct to extant molluscan species indicates a Pliocene age for unit 1 (the lowest marine bed). The presence of Pleistocene land vertebrate remains and the ratio of extinct to extant molluscan species indicate a Pleistocene age for units 2, 3, and 4. For mapping purposes, the lower two units, 1 and 2, are included in the Caloosahatchee Formation. Units 3 and 4 are inclu ed in the Fort Thompson Formation. The following bathymetric interpretations were made on the basis of molluscan and foraminiferal faunal assemblages: unit 1--maximum depth 15-20 fm; unit 2--maximum depth 10-15 fm; unit 3--maximum depth 5-10 fm; and unit 4--less than 5 fm.

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