36 FLORIDA GEOLOGICAL SURVEY-I3TH ANNUAL REPORT

 PLEISTOCENE
 From the known distribution of the Pleistocene of Florida several of the wells, and especially those in the southern part of the state undoubtedly penetrate Pleistocene sands for some distance near the surface. There are, however, no foraminifera in these sands which would give a definite clue as to their age.

 PLIOCENE
 In the earlier report I thought that there was a definite development of the Pliocene in the upper part of the well at Okeechobee. However, a study of the foraminifera from the tipper levels-41 to 56 feet-shows that most of these have a Miocene relation rather than a Pliocene one. Therefore, the well samples give no definite information as to the distribution of the Pliocene below the surface.

 MIOCENE
 Only slight information was available at the time the previous paper was written, but a detailed study Of the foraminifera has shown not only the occurrence of Miocene foraminifera in a number of wells, but that they have definite relations with the Miocene of other regions. The accompanying table shows the distribution of some of these Miocene species: their distribution in the Florida wells and their occurrence in related areas. As the table shows, certain of the levels in a number of wells are very definitely related to, if not identical with the Choctawhatchee Marl of Florida. This is especially marked in the well at Okeechobee, and the upper levels of the wells at St. Augustine, Fort Myers and Marathon The one species noted from the well at Jacksonville also seems to have this same relation. A number of species, especially those from the deeperparts of the wells at Fort Myers, Okeechobee and Marathon, seem to be more closely related to the Miocene of the Gatun formation of the Panama Canal Zone. A number of species also occur in the upper Oligocene of the Panama Canal Zone. The relations to the Miocene Marls of Cuba, Santo Domingo and Jamaica are also indicated.
 As a result of this study, and allowing for errors in drilling, the Miocene may be rather definitely located at the following depths from these wells: