OF THE UNITED STATES. 19 



abounding in multilocular and other shells. Depth 

 61 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 Gryphsea 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- 

 lored marl, containing Belemnites, sharks' teeth, pyri- 



* Travels, p. 477, 475. 



