THE NATIONAL INSTITUTION. 
185 
miles north of Major B’s landing, the cliffs are very high, and the arenaceous fos- 
silliferous stratum becomes fifteen or twenty feet in thickness, and abounds in large 
bivalves. The sand is quartzose and incoherent, and has evidently been the undis¬ 
turbed bed of the sea; for we find the bivalves, generally, not only entire, but ins- 
bedded just in the same position they had lived in when burrowing in their native 
•beds. The large Panopea, so abundant here, is an excellent illustration of this, 
always having its valves in apposition, and placed vertically, like the recent Mycs 
of the sand beach beneath. The following list comprises most of the fossils of this 
locality. Those species which are yet in existence, are indicated by the names 
.being printed in italics ■: 
Bivalves. 
Artemis acetabulum, Conrad. 
Area idonea, Conrad. 
Anomia ephippium, Lin. 
Astarte undulata, Conrad. 
Cytherea Sayana, Conrad. 
Cytherea marylandica, Conrad. 
Crassatella marylandica, Conrad. 
Cardium laqueatum, Conrad. 
Corbula idonea, Conrad. 
Diplodonta americana, De France. 
Univalves. 
Buccinum trivittatum, Say. 
Dispotsea grandis, Say. 
Fulgur tuberculatus, Conrad. 
Fusus rusticus, Conrad. 
Bivalves. 
Isocardia rustica, Sow. 
Lucina anodonta, Say. 
Mya preelonga, Conrad. 
Orbicula lugubris, Conrad. 
Pern a maxillata, Lam. 
Pholas ovalis, Say. 
Pecten Madisonius, Say. 
Tellina biplicata, Conrad. 
Venus Mortoni ? Conrad. 
Univalves. 
Fusus quadricostatus, Say. 
Natica her os, Say. 
Natica duplicata , Say. 
Terebra simplex. 
Serpula granifera, Say. 
Fusus pari-lis, Conrad. 
Coral —Madrepora palmata, Goldfuss. 
The most interesting deposit of medial tertiary fossils, in St. Mary’s county, is 
in the right bank of the river of that name, where the variety and perfection of the 
shells have long since attracted collectors and visiters to the spot. The precipitous 
shore extends at least two miles, interrupted by one small creek, south of which the 
following section is presented : 
10 feet. 
Mixed sand clay, without fossils. 
2 feet. 
Sand and clay, with the same shells as below. 
5 feet. 
Lead-colored clay, with— 
3 group of shells, as given in the lists. 
2 veins of Turritella plebeia. 
1 Panopsea. 
- T ,-||- |. - - _.. 
-St. Mary’s river. 
