GEOLOGY OF FLORIDA 



301 



appears from the inspection of an ordinary map of the land areas. 

 The loo-fathom contour may be taken as the approximate margin 



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Fig. 2. — Thickness of formations as indicated by wells. Vertical scale, one 

 inch equals 400 feet. No. i, well in Wakulla County, eastern part of West Florida; 

 No. 2, well of Palmetto Phosphate Company, Polk County, South Central Florida; 

 No. 3, well of Florida East Coast Railway, on the Florida keys, Monroe County, 

 South Florida. 



of the plateau, since the slope to this line is for the most part gradual, 

 while beyond this contour the slope is steep, and in places, especially 

 toward the south end of the peninsula, is abrupt. Taking this 



