300 E. H. SELLARDS 



wel] samples to have been reached at a depth of 105 feet from the 

 surface; at Daytona, where from well logs it would seem that the 

 Eocene is somewhat shallower than at New Smyrna, lying 

 apparently at less than 100 feet from the surface. The depth to the 

 Eocene has been determined approximately at a few inland towns 

 in this area. At Sanford, fossils of the Ocala formation have been 

 identified by Cushman at a depth of 113 feet. The surface level 

 at the old railway depot at Sanford is given as 20 feet above sea. 

 The surface level at the well is not known buL probably does not 

 differ greatly from the level at the depot. The top surface of the 

 Eocene therefore is probably somewhat less than 100 feet below 

 sea-level. At Orange Mills the limestones, probably Eocene, have 

 been reported at a depth of 130 feet, the surface elevation at this 

 place being about 15 feet above sea-level. A slightly increased 

 depth to these limestones is suggested by well records at Hastings. 



In the well of the Palmetto Phosphate Company in Polk County 

 the top of the Ocala is placed by Cushman at 360 feet. The surface 

 elevation at Fort Meade is 130 feet above sea. Hence the actual 

 level of the top surface of the Ocala formation is probably somewhat 

 more than 200 feet below sea-level. 



That part of the peninsula in which the Eocene formations so far 

 as known lie at a -depth of more than 200 feet below sea-level 

 includes a small area in the northeastern part of the state and the 

 whole of extreme southern Florida as well as a coastal belt west of 

 the Apalachicola River, The depth at which the Eocene is known 

 more or less definitely is indicated at several localities within this 

 large area although the data is as yet very limited. There is in 

 particular complete lack of information, as indicated by the use of 

 the question mark on the map, in the southern part of the lake 

 region, where the older formations may be expected to lie rather 

 close to the surface. 



ASYMMETRY OF THE FLORIDIAN PLATEAU 



The actual position and extent of this plateau, as has been shown 

 by Smith, Vaughan, and others,^ is strikingly different to that which 



^ Eugene A. Smith, "On the Geology of Florida," Am.. Jour. Set. (3), XXI (1881), 

 292-309; T. Wayland Vaughan, "A Contribution to the Geologic Histor-y of the 

 Floridian Plateau," Carnegie Institution of Washington, Pub. No. 133, 1910. 



