363 The Oligocene of the Southern United States 53 



or Orbitoides limestone of Vicksburg age.-'' 



Much of the limestone referred by Mr. Smith to the Vicks- 

 burg has proven of somewhat more recent formation, but he 

 refuted the coralline theory by proving the existence of Tertiary 

 deposits on the peninsula. 



Tampa limestone referred by Heilp?'in to the Santo Do^ningo 

 Miocene. Prof. Heilprin.f in 1887, referred the Tampa limestone 

 to the Miocene because he found a close resemblance between the 

 species of the Florida rock and those of the Santo Domingo 

 Miocene beds. During the same year, Dr. Dall also noted this 

 affinity of the fauna of the Tampa limestone and that of the 

 Antillean Miocene.]: 



The Chattahoochee series in northzvestern Florida. Seflion at 

 Old Chattahoochee Landijig {see page 52). A number of sedlions 

 were made at various bluffs along the Appalachicola River by 

 Prof. Harris in 190 1. Of these sections, the most northern was 

 taken at Old Chattahoochee Landing, about one mile above the 

 railroad bridge, on the eastern side of the river, following the road 

 from Rena Harding's ferry to Chattahoochee village. The lower 

 portion, from the base up to 83 feet, was run with a Dumpy level, 

 the upper portion by Locke level. The river surface was about 

 23)^ feet below the railroad rails when the secflion was made. 

 From this level as a base, the height of the bluff was found to be 

 178 feet. 



The rocks of the Chattahoochee series in this locacity are all 

 light colored, and often poorly consolidated. The greenish layers 

 are commonly soft clays, but even these are harder than the 

 majority of the white beds. A layer with Helices was noted by 



* To explain the absence, according to this theory, of Grand Gulf de- 

 posits in Florida, Mr. Smith suggests that the western coast line of the Eocene 

 peninsula was much to the westward of the present shore line, and that the 

 Grand Gulf deposits are now submerged, as is indicated by the submarine 

 shelf extending far out into the Gulf of Mexico. 



t Exploration of the West Coast of Florida, Trans. Wag. Free Inst. Sn'., 

 vol. r, 1S87. 



t Notes on the Geol. of Florida, Amer. Jour. .Sci., 3rd ser., 1887, vol. 34, 

 pp. 161-170. 



