cushman: cretaceous age of limestones 71 



Near Burns, Wakulla County; 2,153 feet. 



Jacksonville, Duval County; 980 feet. 



St. Augustine, St. Johns County; 1,440 feet. 



Anthony, Marion County; samples from 50-500 feet. 



Kustis, Lake County; samples from 100-180 feet. 



Bushnell, Sumter County; samples from 380-3,080 feet. 



Apopka, Orange County; samples from 50-390 feet. 



Sanford, Seminole County; samples from 95-113 feet. 



Cocoa, Brevard County; a sample from 190 feet. 



Tiger Bay, Polk County; 770 feet. 



Okeechobee, Okeechobee County; samples to 500 feet. 



Fort Myers, Lee County ; 950 feet. 



Marathon, Key Vaca, Monroe County; 2,300 feet. 



The examination showed many Foraminifera, among w^hich 

 were two species of the genus OrhitoUna occurring at different 

 levels. One of these, a small conical species, is encountered 

 at much higher levels than the other which is a large, low, some- 

 what concave species. The first of these is very close to, or 

 identical with, a species of OrhitoUna known from the Quitman 

 Mountains of Western Texas, where it characterizes a horizon 

 of the Fredericksburg group of the Lower Cretaceous. A species 

 seemingly identical is found in the Lower Cretaceous of the 

 Province of Navarra in northern Spain. Other species of different 

 groups, echinoderms, etc., are identical in Spain and northern 

 Mexico in the Lower Cretaceous, 



Below the Fredericksburg in the Quitman Mountains, in the 

 same section, in the Trinity group of the Lower Cretaceous 

 are horizons marked by great numbers of OrhitoUna texana which 

 is seemingly identical wdth the larger species of the Florida well 

 borings and found only at some depth below the conical species. 

 In the borings accompanying these species are others that are 

 close to Lower Cretaceous species of Europe. 



The limestone characterized by these species of OrhitoUna 

 seem to underlie practically the whole of the peninsula of Florida, 

 being found in the wells at the north near Burns, Jacksonville, 

 and St. Augustine, in the well at the south on Key Vaca, and 

 in the central region at Anthony, Eustis, Bushnell, Apopka, and 

 Tiger Bay. 



Assuming the altitude above sea level at Apopka as 150 feet, 



