PETROLEUM POSSIBILITIES OE FLORIDA 
55 
tions, and operates at a disadvantage in soft formations. By means of 
the diamond drill, a continuous core is taken in the hard-rock forma¬ 
tions, which is of great value in prospecting for oil and gas. 
With respect to the drilling conditions in Florida it may be said that 
throughout much of the state a rotary drill may be used if desired. In 
the Eocene limestones are found flint nodules and occasional flint layers 
which may require a special bit for the rotary drill. The Tampa lime¬ 
stone, likewise, is somewhat flinty. In extreme south Florida and on 
the Florida keys are some rather hard limestones, such as the coral 
limestone of Key Fargo and the fresh-water limestones of the Ever¬ 
glades. For the most part, however, the rotary may be used if desired. 
Fig. 8. “Falling Water,” four miles south of Chipley, Washington County. The 
test well of the Chipley Oil Company was drilled near this sink. 
