572 [Feb. 26. 



scopically. Loose flints of this formation, containing spines of 

 echini and other fossils, are scattered over the surface of the 

 country, like chalk-flints in England. At Millhaven, in Scriven 

 County, about eight miles from Stony Bluff, and five in a direct 

 line from the Savannah River, the siliceous beds crop out on the 

 banks of a small stream. In tlie flints here I found casts of several 

 shells of the genera Valvata, Pecteti, and Terebratula, with a 

 species of Cidaris. It was evident to me that this millstone be- 

 longs to the same formation of red loam and sand which extends 

 almost uninterruptedly from Aikin and Augusta to this region, for 

 I observed near Millhaven, where the deposit has been pierced 

 through to the depth of 26 feet in wells, pieces of white kaolin 

 embedded, like those before mentioned near Augusta. 



Jacksonhord, Scriven County. 



Section of Eocene Strata on the Right Bank of Beaverdam Creek, 

 SciuvEN County, Georgia. 



a. Ijiniestone. 



h. White marl. c. Yellow and red sand and clay of 



the burr-stone formation. 



About eigiit miles from the Savannah River, and one mile west 

 of Jacksonboro', a limestone occurs, covered with sand, in the 

 fork of Briar and Beaverdam Creeks, which has been quarried for 

 lime. This limestone (a) passes upwards into marl {h\ which has 

 an undulating surface, as represented in the annexed section, 

 and appears to have been denuded before the deposition of the 

 incumbent sand and loam (c). The height of the clitf is about 

 25 feet, the thickness of the calcareous formation varying from 10 

 to 15 feet, and the yellow sand which rests upon it from 3 to 10 

 feet. 



From this limestone of Jacksonboro' I obtained, besides corals 

 and echinoderms, thirty species of shells, the larger portion of 

 which were kindly presented to me by Colonel Jones of Millhaven. 

 Those in italics agree specifically with fossils from Claiborne, Ala- 

 bama, or other eocene localities, Avhich I have specified. 



Fossil Shells of Jacksonboro' , Scriven Co., Georgia. 



Oliva Alahamensis 

 Valuta prisca 



Conus, same as one from Shell Bluff 

 Rostelliria or Strombus (casts), four 

 species 



Fusus inauratns 



Cerithium Georgianum LyeJl §• G. 



Sowerhy, see fig. a, b. 

 Melania, see fig. c. 

 Paludina ? 



