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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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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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