Pleistocene marine fossils are abundant along both the east and the west coasts of Florida, but have not been found higher than 25 feet above sea leavel. Most of these species are still living in the coastal waters of the State, and thus no significant climatic change is indicated. This study supports the view expressed by previous workers that the Anastasia formation and the Miami oolite were contemporaneous and that the Key Largo limestone represents a coral-reef deposit probably of the same age. The Fort Thompson formation may be of the same age, or parts of it may be younger. These fossiliferous deposits appear to merge with the Pamlico terrace and formation of Georgia and farther north. If this correlation is correct, the Florida deposits under consideration probably date from the last major interglacial stage.