g 6 FLORIDA GEOLOGICAL SURVEY-TWELFTH ANNUAL REPORT 
the first trace of Lepidocyclina appears and the Lower Oligocene. 
The species, however, is not like those of the Coastal Plain area, 
but is more like certain species of Cuba. 
After a non-foraminiferal series of hard granular limestones 
conical Orbitolina is found at 1,248 feet and is scattered in the 
samples from this level down to the bottom of the well. Larger 
specimens occur than those found in central and northern Florida. 
This is evidently the Lower Cretaceous. From 1,318 feet occur 
large specimens with flatter tests and these in turn are scattered all 
the way down. At 1,740 feet and below are found the large spe¬ 
cies with the concave base representing probably the Trinity group 
of the Lower Cretaceous. Other Lower Cretaceous forms occur 
with the Orbit olina as in other wells. 
GENERAL STRATIGRAPHY SHOWN BY THE WELL 
SAMPLES. 
Two main groups of formations are the most easily determined 
when present from the abundance of their fossils. These are the 
Ocala limestone which is represented by several species of Lepido¬ 
cyclina, Heterostegina and Operculina as well as smaller forms, 
and the Lower Cretaceous which is characterized by species of 
Orbitolina. In addition, below the Ocala is usually a horizon dis¬ 
tinguished by an abundance of thick Nummulites. 
The Ocala limestone, often termed Vicksburg in the older re¬ 
ports, has been shown by Cooke (U. S. Geol. Surv., Professional 
Paper 95-I, 1915) to be of upper Eocene age. There seem to be 
two facies at least of the Ocala in Florida, one that about Ocala 
the type locality where the most abundant fossili feral genus is 
Lepidocyclina of several species without Orthophragmina. The 
other facies is characterized especially by various species of Ortho- 
phragmina and in some areas by a large Lepidocyclina as well, but 
of a different species from those of the. Ocala region. 
In the Coastal Plain area there is a development of Num¬ 
mulites of the form found in the well samples of Florida and rep¬ 
resenting probably the upper Claiborne. Its position in the wells 
is especially valuable as marking a level somewhat below the base 
of the Ocala. 
The Lower Cretaceous is marked by various species but es- 
