On the Secondary and Tertiary Formations. 343 
cask of Thomaston lime, three dollars! The locality is prob- 
ably injudiciously sblectéd, as it is eight miles from the river, up 
a little stream called Brier’s creek, which is navigable for boats 
and rafts but a short time in the year, while the same bed might 
no doubt be found and opened on the river. 
The inferior limestone at Shell Bluff belongs to a higher for- 
mation, and cannot be so important, though here too a great deal 
of cheap lime might be made from the rock and the fossil Ostrea. 
The specimens I collected at Shell Bluff, and on which I de- 
pended to describe the locality, having been lost, I will attempt 
no account of it, as it could now be only a repetition of what 
others have said. In one of the lowest fossiliferous bands at 
the bluff, I discovered a small jaw bone of some land animal, 
which has not before been noticed there. 
Fossils found at the Natural Well, 
in italics are new ;- oH those unde- 
Balanus ovularis. F 4 va dumosa. | 
lunatum. ‘ F Fasciolaria mutabilis. 
“ interruptum. — - rhomboidea. 
“ multirugatums . Fissurella. ~_— 
# obsoletum. — .- * Fulgur canaliculatus. 
Calyptrea costata. wy ng expeentys, 
Calyptrea. E50 “  perversus. 
Calyptrea. F 
Cancillaria lunata. 
“. 
Cardita tridentata.. Lucina Jamaicensis. 
ae ns. 
perplana. 
Carditamera arata. “ trisuleata. 
Cerithium Carolinensis se depressa. 
7 dislocatum. Mactra crassidens. 
ec &  congesta. 
