98 FLORIDA GEOLOGICAL SURVEY-TWELFTH ANNUAL REPORT 
LOWER CRETACEOUS. 
Except for the well at Panama City in the western part of the 
State and the three across southern Florida at Okeechobee, Fort 
Myers and Boca Grande, the conical form of Orbitolina is found 
in all the wells or probably would have been if samples from the 
right depths had been available. The wells where it is not found; 
at Bushnell because samples began at too low a level; and at San¬ 
ford and Cocoa the samples are only' from the level of the Ocala 
and do not represent greater depths. The three wells across south¬ 
ern Florida would undoubtedly have shown this formation at 
deeper levels than those from which samples are available. 
We may safely infer then that practically the whole of the pen¬ 
insula of Florida and probably large areas of the submerged Flor¬ 
idian Plateau are underlain by: limestones of the Lower Cretaceous 
at least as old as the Fredericksburg group. It seems also safe to 
assert that below these are other older beds of age corresponding 
to the Trinity or lowest group of the Lower Cretaceous. Still 
older horizons are indicated but until comparisons can be made 
with other areas, not at present available, the age of these is un¬ 
certain. 
The position of the upper levels of the Lower Cretaceous as 
represented by the Fredericksburg can only be taken as the level 
at which the conical Orbitolina is first recognized. It may in places 
extend somewhat above this level but probably not to any great 
height. This level then can be determined. The level of the top 
of the well bore is not indicated in any instance but as a basis the 
height above sea-level of the town in which the well is located is 
taken. These are mostly given in the Fifth Annual Report of the 
Florida Survey. Assuming the height at Apopka as 150 feet above 
sea-level as the conical Orbitolina appears at 115 feet below the 
surface, the Lower Cretaceous beds here actually stand 35 feet 
above present sea-level.* Using the same data, at Eustis the Lower 
Cretaceous would be less than 100 feet below sea level and at An¬ 
thony 33 feet below sea level. In other localities it appears at St. 
* According to levels supplied by the Atlantic Coast Line Railway to the 
Florida Survey, received subsequent to the preparation of this manuscript, the 
level of the depot at Apopka is 125 feet above sea, and the well is reported 
by Mr. Hull who preserved the samples as being 8 or 10 feet above the depot. 
