38 FLORIDA GEOLOGICAL SURVEY I3TH 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 forma- 

 tions 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 mate- 

 rial between 200 and 440 feet, therefore the iower 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 Myers, Lee County, Fla. From the specimens ob- 

 tained at 300, 360, 600 and 680 feet, it is very clear that the levels between 

 300 and 600 feet should be definitely referred to the Miocene : that at 680 

 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 600 feet 

 is related to the Gatun formation of the Panama Canal Zone. 



Well of the Okeechobee Ice and Electric Company at Okeechobee, Okee- 

 chobee County, Fla. Allowing for possibilities of error, the specimens indi- 

 cate Miocene from 51 feet to 458 feet. Most of the species of the Okeecho- 

 bee Well are clearly related to those of the Choctawhatchee Marl, and a 

 few to the Gatun formation of the Panama Canal Zone. 



Well of Florida East Coast Railway at Alarathon, on Key Vaca. ]Mon- 

 roe 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 180 feet ; those from 398 feet are perhaps more closely re- 

 lated to the Gatun of the Panama Canal Zone. There is a considerable dif- 

 ference 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 condi- 

 tions, 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 OHgo- 

 cene, and in the upper OHgocene of Panama. Angnilla and Cuba, 

 there are horizons characterized by species of Orhitolites. At An- 

 guilla and Cuba these occur with a large form of Gypsina globulus 

 Reuss. In the well at Marathon this same combination of Orhito- 

 lites and Gypsina occurs at a depth of 589 to 628 feet and probably 

 represents an equivalent of West Indian Upper Oligocene. Orhito- 

 lites is present in the well at Panama City, and may possibly rep- 

 resent this .same general age in that well. 



