ae eee i. ie a Ne 
ogee ON ie cae) a em arey ied Oram Te skePiw tort geen ae =n 
K. A. Smith— Geology of Florida. 301 
so 
other) is continued, according to my own observations and 
those of others, nearly’to the Everglades. Although observa- 
ions are as yet wanting, to prove that the Okefinokee swamp 
Feposes upon a bed of Vicksburg limestone, yet the occurrence 
of that rock along its southwestern and southern edges in 
Florida, as above mentioned, makes it very probable that such 
will be found to be the case, especially when we consider the 
fact that farther south along this ridge and particularly along 
its western slope in Alachua, Marion and Sumter Counties, the 
Orbitoides limestone is everywhere the underlying formation, 
Sometimes hidden by overlying sands, but often outcropping 
over extensive areas. 
. The enumeration of a few localities from which character- 
'stic fossils have been collected, will make more definite this 
seneral assertion. Orbitoides limestone is the prevailing, and 
I might say the only, rock in the vicinity of Gainesville, 
jany of the chimneys and pillars of the houses there are 
. i 
ces O. Manielli, forms it to the almost total exclusion of 
every other species. 
ayne’s Prairie, south of Gainesville, already mentioned 
above, occupies a depression or sink in this li @. 
he observations of Professor J. W. Bailey quoted above, 
show that the same formation extends at least to within forty 
miles of Pilatka. Between Gainesville and Ocala in Marion 
County, the chimneys of the farm-houses reveal the character 
“ the underlying rock. At Ocala, it outcrops in numerous 
localities, Orbitoides Mantell’, here as at Gainesville, often form- 
ng the entire rock. Silver Spring, six miles east of Ocala, 
oe a basin in the same limestone. This is one of the 
“gest of the very numerous sulphur springs of the peninsula. 
Steamers from the Ocklawaha come up into the spring where 
mipy ar easily turn. The waters of the spring as well as of 
tally clear, the jagged edges of the limestone banks, the numer- 
ra * lish, and even objects lying upon the bottom, being dis- 
Xetly visible from the deck of a steamer. 
M Pecimens of limestone from Silver Spring were found b 
'. Heilprin, to be composed of O. Mantelli Morton and 0. 
Pera Con., to the exclusion of other forms except polyzoa. 
About Ocala, southward and southwestward, is a belt of 
