Abstract
Excerpt: Synchronous deposition of carbonate and siliciclastic sediments occurred on the South Florida Platform during the late Oligocene to early Pliocene, produced a large number of complex mixed carbonate/siliciclastic lithologies, some perhaps unique to the region. All 14 defined subfacies contain a mix of carbonate and siliciclastic sediments along with quartz sand and phosphorite grains. Only a small percentage of the stratigraphic section contains sediments with a solely carbonate or solely siliciclastic composition. Transitions between subfacies are both transitional and abrupt. The hypothesis that carbonate and siliciclastic mixed sediment sequences show mostly abrupt boundaries (Mount, 1984) is not supported.