AGE OF THE UNDERLYING ROCKS OF FLORIDA 85 
as Pleistocene with possibly some Pliocene, while at about 33 feet 
the Miocene begins and continues to a depth of at least 496 feet 
as given by older records. 
At 510-550 feet is either Oligocene, or the Upper Ocala indi¬ 
cated by the Lepidocyclina fragments and those of Operculina. 
These occur more frequently here and suggest that if, as is prob¬ 
able, they are from the Upper Ocala, this formation has some¬ 
where near its usual forty feet of thickness at this point. The 
. other scattered fragments below probably originated at this level. 
Below 550 feet specimens of Nummulites occur, indicating an 
Eocene horizon below the Ocala as noted elsewhere. 
No definite new things appear until at 820-845 feet, where 
Orbitolina of the conical form appears, indicating that somewhere 
in this range the Lower Cretaceous of the Fredericksburg is en¬ 
tered. This is more clearly defined between 845 and 900 feet. 
Somewhere between 900 and 980 feet the large, low forms of 
Orbit olina appear, indicating that a lower portion of the Fred¬ 
ericksburg appears or more likely that beds of the Trinity group 
are, entered. 
PONCE DE LEON WELL AT ST. AUGUSTINE, ST. 
JOHNS COUNTY, FLORIDA. 
The description of the samples from this well is given earlier 
(Florida Geological Survey, Fifth Annual Report, 1913, pp. 195, 
196). Depth of well 1,440 feet. Depth of casing unknown but 
probably not great. 
As sent me, the samples cover but a few points in the depth 
drilled but show certain significant facts: 
160-200 feet. Few foraminifera, but Miocene indicated. 
440 feet. Numerous conical Orbitolina. 
785,830,1051 feet. All show the same Orbitolina. 
PROBABLE STRATIGRAPHY. 
Although there are no samples between 200 and 440 feet, the 
Ocala must occur in this range as two fragments of Lepidocyclina 
were found in the. sample from 995 feet evidently originating far 
above. According to determinations by Dr. W. H. Dali (U. S. 
