38 FLORIDA GEOLOGICAL SURVEY-I3TIH ANNUAL REPORT

 New City Well at Jacksonville, Duval County, Fla. The Miocene reaches its lowest limit somewhere between 510 and 550 feet. In this same range Lepidocyclina fragments occur, indicating that the line between these formations comes somewhere in those forty feet.
 Ponce de Leon Well at St. Augustine, St. Johns County, Fla. Miocene foraminifera very definitely shown at 88, 170 and 200 feet. I had no material between 200 and 440 feet, therefore the lower limit of the Miocene can not be definitely determined.
 Well No. 3 of the Palmetto Phosphate Company, near pit No. i, about 2% miles northwest of Tiger Bay, Fla. Although the foraminifera were largely lacking or poorly preserved in the upper 310 feet, it is probable 'that' a considerable amount of this should be placed in the Miocene.
 City Well at Fort Mlyers, Lee County, Fla. From the specimens obtained at 300, 360, 6oo and 68o feet, it is very clear that the levels between 300 and 600 feet should be definitely referred to the Miocene: that at 683 feet may possibly be Upper Oligocene. The material at 300 feet seems to be closely related to the Choctawhatchee Marl, while that at 360 and 6oo feet is related to the Gatun formation of the Panama Canal Zone.
 Well of the Okeechobee Ice and Electric Company at Okeechobee, Okeechobee County, Fla. Allowing for possibilities of error, the specimens indicate Miocene from 51 feet to 458 feet. Most of the species of the Okeechobee Well are clearly related to those of the Choctawhatchee Marl, and a few to the Gatun formation of the Panama Canal Zone. I
 Well of Florida East Coast Railway at Marathon, on Key Vaca. -\Ionroe County Fla. Samples from 78, 180 and 398 feet all seem to be definitely Miocene and very closely related to the Choctawhatchee Marl, especially those from 78 and i8o feet; those from 398 feet are perhaps more closely related to the Gatun of the Panama Canal Zone. There is a considerable difference between the species found at Marathon and those found at the other wells in the region, probably due in part to the difference in ecological conditions, owing to the warmer waters in the southern part of the area.


 MIDDLE AND UPPER OLIGOCENE

 In the Tampa formation, which is now classed as Upper Oligocene, and in the upper Oligocene of Panama, Anguilla and Cuba, there are horizons characterized by species of Orbitolites. At Anguilla and Cuba these occur with a large form of Gypsina globiu/us Reuss. In the wvell at Marathon this same combination of Orbitolites and Gypsina occurs at a depth of 589 to 628 feet and probably represents an equivalent of West Indian Upper Oligocene. Orbitolites is present in the well at Panama City, and may possibly represent this smnie general age in that well.