52 Foerste — Eocene and Miocene of Georgia and Florida. 



hoochee as shown at Wiley's Landing. The top of the friable 

 limestone of Old Chattahoochee would then reach a level of about 

 65 feet above the base, and the lowest exposure at Aspallaga 

 Bluff about five and a half miles farther south, would be at 

 least SO feet above the base of the Chattahoochee. The main 

 body of the rock exposed at Aspallaga is evidently closely related 

 to the localities just mentioned farther north. The soft friable 

 rock, here containing shark's teeth, and other teeth which we 

 judged to be reptilian, also apparently fish bones, was abundantly 

 represented. Harder courses contain the ordinary middle 

 Chattahoochee fauna. More siliceous layers occur, but their 

 presence is also familiar along the railroad exposures half a 

 mile northeast of Chattahoochee Junction above mentioned. 

 The top of these Chattahoochee limestones rises according to 

 Dall and Stanley-Brown about 50 feet above the river level. 

 This would place it at least 130 feet above the level of the 

 base of the Chattahoochee, and would give the Chattahoochee 

 bed itself a total thickness of at least 100 feet. 



Griffin hed and Aspallaga clays. — The Asjiallaga clays 

 with its Oysters and Pectens we did not see. This is unfortu- 

 nate since we found a hard rock full of Orbitolites and a few 

 other shells at a level which seemed to us, judged only by the 

 eye and the effort it required to reach the locality, to be much 

 higher than 50 feet above the river level. This rock is litho- 

 logically and paleontologically identical with that at Griffin's 

 Creek and seems to promise considerable as a valuable means 

 of correlating various horizons. I shall call it the Griffin hed, 

 and believe its location to be at the top of the Chattahoochee 

 bed, and therefore about 50 feet above the river level or a 

 hundred and thirty feet above the base of the Chattahoochee. 

 Above the Griffin bed occur the Aspallaga clays. 



GriffirCs Creek locality* — At the Griffin's Creek locality, 

 four and a half miles south of Bainbridge, on the west side of 

 the road, about half a mile west of Griffin's house, and a little 

 north of a plantation shed occurs an exposure of interest in 

 this connection. The lowest exposure at this locality is a 

 brecciated limestone, about 2 feet thick. Above this lies the 

 peculiar Griffin bed, cavernous on account of the dissolution of 

 the many gasteropod shells once contained in them, and still 

 containing many specimens of Orbitolites. This bed may pos- 

 sibly be 6 to 8 feet thick at this point. In the calcareous clay, 

 often already deep red, or clayey brown owing to decomposi- 

 tion, there are found the same Anomia and apparently the 

 same Pecten as in the Aspallaga clays of Rock Bluff. This 

 would place the Griffin Creek bed at the junction of the 



* Loc. cit.. page 447. 



