58 FLORIDA GEOLOGICAL SURVEY SIXTH ANNUAL REPORT. 



ter County on the south and from the Suwanee River and the Gulf 

 coast to eastern Alachua and Marion Counties. Aluch of the hard 

 rock phosphate rests upon and in this tlint-bearing Umestone, and 

 from the phosphate pits great quantities of the flint may be ob- 

 tained. Occasional flint hills such as that near Evinston and Mic- 

 anopy stand out as evidence of the resistance of flint to the weather- 

 ing agencies, the surrounding limestone having disappeared 

 through erosion. This flint lies chiefly within the Vicksburg lime- 

 stones. It is not to be inferred, however, that no other Florida 

 formations contain silica. On the contrary, many of the forma- 

 tions are highly siliceous. The Vicksburg limestones are, how- 

 ever, the chief flint-bearing formations of Florida. 



Fig. 19. — Exposure of Caloosahatchee marl. 



The production of both sand and concrete is necessarily inade- 

 quately reported owing to the large number of small and occasional, 

 operators. 



The following is a list of the companies in Florida that have 

 reported the production of sand for building purposes or crushed 

 rock for concrete during 191 3: 



Blowers Lime and Phosphate Company, Ocala. 

 Crystal River Rock Company, Crystal River. 

 Florida Crushed Rock Company, Montbrook. 

 Lake Wier Sand Company, Lake Wier. 

 E. P. Maule, Fort Lauderdale. 

 Woodman & Company, Ocala. 



