THE NATIONAL INSTITUTION, 
181 
Feei in thickness . 
Section at Fair Haven. 
Bay* S. 
50 
Whitish clay. 
Bones of cetacea. 
3 
5 
Clay, with siliceous casts of marine shells, and fragments of 
bones. 
Clay, with Ostrea percrassa, Pecten Humphreysii. 
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 lias produced 
the jointed structure of ancient rocks. 
The 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 
Incoherent 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. Bivalves. 
Astarte varians, Conrad. 
Astarte exaltata, Conrad. 
Artemis acetabulum, Conrad. 
Area subrostrata, Conrad. 
Area depleura, Conrad. 
Cytherea subnasuta, Conrad. 
Cardiuul leptopleura, Conrad. 
Crassatella mclina, Conrad. 
Corbula idonea, Conrad. 
Corbula elevata, Conrad.' 
Univalves. 
Isocardia Markoei, Conrad. 
Lima papyria, Conrad. 
Lucina Foremani, Conrad. 
Lucina subplanata, Conrad 
Lucina crcnulaia, Conrad. 
Pectunculus lentiformis, Conrad, 
Venus latilirata, Conrad. 
Venus Mortoni ? Conrad. 
Veniis staminea, Conrad. 
Univalves.. 
Bonellia lineata, Conrad. 
Cancellaria biplicifera, Conrad, 
Cancellaria engonata, Conrad. 
Bentalium thalloides, Conrad- 
Pleurotoma bellacrenata, 
Seal aria pachypleura, Conrad. 
Solarium trilineatum, Conrad, 
Sigaretus fragilis, 
