THE NATIONAL INSTITUTION. 



181 



Section at Fair Haven. 



Feet in thicJ:ness. 



Bay. S. 



N. 



This locality is interesting from the phenomenon of fissures or vertical joints 

 similar to those of primary and silurian rocks, traversing the whole strata without 

 interruption, evidently the result of the same general cause which has produced 

 the jointed structure of ancient rocks, 



Tlie next point to which our attention was directed, is near Colonel Blake's on 

 the Chesapeake, about twenty miles south of Fair Haven, where the cliff is at 

 least one hundred and fifty feet high. At base we found a clay replete with a 

 species of Tellina, probably new, and over this, at about six feet elevation, a thin 

 stratum of Ostrea percrassa. The upper portion of the cliff consisted of sand and 

 clay, and appeared to be destitute of organic remains. 



A few miles south, upon the bay shore, we came to an interesting ravine on the 

 farm of Captain Hance, a locality I had visited last spring. A small stream has 

 worn a channel in the bank, and exposed beds of a mixture of sand and clay, very 

 mcoherent in general, and the fossils extremely numerous, though difficult to pro- 

 cure in the usual state of perfection of medial tertiary shells. The elevation is but 

 a few feet above the level of the bay. 



The species obtained here are comprised in the following list : the recent species 

 in italics: 



Bivalves. 



Astarte varians, Conrad. 

 Astarte exaltata, Conrac^. 

 Artemis acetabulum, Conrad. 

 Area subrostrata, Conrad. 

 Area depleura, Conrad. 

 Cytherea subnasuta, Conrad. 

 Cardium Icptopleura, Conrad. 

 Crassatella melina, Conrad. 

 Corbula idonca, Conrad. 

 Corbula elevata, Conrad. 



Univalves, 

 Boncllia lineata, Conrad. 

 Cancollaria biplicifera, Conrad. 

 CancoUaria engonata, Conrad. 

 Dentalium thalloidcs, Conrad. 



Bivalves. 



Isocardia Markoei, Conrad. 

 Lima papyria, Conrad. 

 Lucina Foremani, Conrad. 

 Lucina subplanata, Conrad 

 Lucina crenidata, Conrad. 

 Fectunculus lentiformis, Conrad. 

 Venus latilu-ata, Conrad. 

 Venus Mortoni ? Conrad. 

 Venus staminea, Conrad. 



Univalves. 



Pleurotoma bellacrenata, 

 Scalaria pachypleura, Conrad. 

 Solari)im trilineatimi, Conrad. 

 Sigarctus fragilis, 



