48 Foerste — Eocene and Miocene of Georgia and Florida. 



Strike of the Vicksburg indicated by the Bainbridge bed exposures. 



The Bainbridge marl exposure at the Natural Bridge, 3 

 miles north of Marianna in Florida, lies about 40 miles west 

 of Bainbridge in Georgia, or to be more precise, about S. 78 W. 

 and this is so far the nearest approximation to an estimate of a 

 strike for any great distance in southwest Georgia and adjacent 

 Florida. Judging from this line of strike the Bainbridge 

 marl should be exposed somewhere in the vicinity of Miriam's 

 Landing on the Chattahoochee River. The line of outcrop of 

 the Chattahoochee curves strongly northwards east of Bain- 

 bridge, but until the observations over that part of the area 

 are accurate enough to determine the dip, and the elevation of 

 localities above the sea, and from these data to calculate the 

 real strike, it is only possible to say that strike of the Chatta- 

 hoochee is probably very soon changed to strongly towards the 

 northeast on passing Bainbridge, since the nearest point where 

 the position of this horizon can again be approximately deter- 

 mined is near House Creek on the Ocmulgee. 



Correlation of various exposures in Decatur County, Georgia, 

 with the soft white limestone at the top of the Vicksburg, above 

 layer g of the Flint River section, and the base of the Chatta- 

 hoochee. 



1. The limesink on the Camilla road. — Fifteen and a half 

 miles northeast of Bainbridge, on the old Bainbridge-Camilla 

 road, and west of the Whigham-Camilla road, is a very 

 fine limesink, well known in the adjoining counties. On 

 a trip with Mr. Alfred Brooks a short examination of 

 the same was made. The depth of the sink was estimated 

 at, at least, 45 feet. A rapid stream about 6 feet broad 

 enters the sink on one side, where the walls are vertical, and at 

 the base disappears again under a recess beneath the cliff. 

 Elsewhere the walls of the limesink are very steep but can 

 be descended. At the bottom the well known Orbitoides, 

 Pectens, and other remains of the Yicksburg Eocene were dis- 

 covered. The general mass of the rock is whitish and soft, 

 turning to more drab and becoming more hard at certain levels, 

 especially towards the top. The rock over which the stream 

 flows before plunging into the limesink is lithologically dis- 

 similar, light brown, soft, porous, argillaceous with fossils only 

 as casts. Although fossils were not rare, most of them were 

 poorly preserved, and while their general aspect was that of 

 Chattahoochee fossils it would require more extended study to 

 assert their position, since many of the forms appeared new to us, 

 we having collected so far only in the more southern exposures 



