OF THE UNITED STATES. 19 
abounding in multilocular and other shells. Depth 
6: feet. 
6. A white siliceous sand, which, about two hundred 
yards further west, rises twelve or fifteen feet above 
its level at this point, and contains Lignite in vast 
quantity; sometimes even the trunks of trees twenty 
or thirty feet long, and a foot in diameter. No other 
organic remains were observed in it. 
The calcareous strata have not yet been detected in 
Delaware. 
MARYLAND. 
I am informed that the Ferruginous sand occurs below 
Annapolis, in this state, at which place it is chiefly char- 
acterized by Alcyonia. Mr. Conrad obtained at Fort 
Washington, on the Potomac, a solitary valve of Exogyra, 
indicating the presence of this formation. 
VIRGINIA. 
A writer, in the American Journal of Science, speaks 
of the occurrence of Belemnites and Gryphza on James 
river, but gives no locality. 
NORTH CAROLINA. 
Ferruginous sand. This is well developed at Ashwood, 
on Cape Fear river, where, according to the late Mr. 
William Bartram,* there are several beds of dark co- 
Jored marl, containing Belemnites, sharks’ teeth, pyri- 
* Travels, p. 477, 475. 
