IOO FLORIDA GEOLOGICAL SURVEY-TWELFTH ANNUAL REPORT 
present in any part of the Florida peninsular. This is a very 
sweeping statement for so large a region involved, but the Upper 
Cretaceous is characterized by Foraminifera which should be 
easily recognized between the Orbitolina bed and the Ocala if they 
occurred. 
The absence of Upper Cretaceous strata may be explained by 
subsequent erosion or that this whole area was a land mass during 
Upper Cretaceous time. 
It is known that in late Lower Cretaceous times various areas 
of North America were elevated. Further if as indicated by Bar¬ 
rel! there was a raising, without folding, of the western Piedmont 
and Appalachian areas at least several hundred feet at this time 
such movement may have taken place in Florida. If this occurred 
at the end of the Lower Cretaceous and the area was above water 
during Upper Cretaceous time there could not have been very 
great elevation at any time or there would be more evidence of 
inequalities of the surface. It is possible that there was a low ele¬ 
vation during this entire period and during that time the upper 
series of the Lower Cretaceous represented by the Washita series 
of Texas may have been worn away. 
If the entire series of the Cretaceous were deposited and then 
subsequently removed it would have involved considerable uplift 
and the structure would probably be different from that now in¬ 
dicated. 
EOCENE. 
In the well samples the earlier Eocene seems to be entirely lack¬ 
ing but the Claiborne seems to be represented at least in the region 
northward from Tiger Bay by the bed containing abundant thick 
Nummulites and the upper Eocene by the Ocala from Tiger Bay 
northward with the exception of the Apopka region. The Num- 
mulite bed can be considered with the Ocala as it seems to be con¬ 
formable with that when found. 
The Ocala was not recognized in the well samples examined 
from south of Tiger Bay and the well at Marathon indicates that 
it may not have been developed in its typical form much south of 
the Tiger Bay region. The Ocala was developed in comparatively 
shallow water as its fauna indicates. At any rate, in the Marathon 
