182 



PROCEEDINGS OF 



Univalves. 

 Tiochus peralvcatus, Conrad. 

 Turritclla indenta, Courad. 

 Turritclla exaltata, Conrad. 

 Turritclla perlaqucata, Conrad. 

 Voluta solitaria. 



Univalves. 

 Fissurella marylandica, Conrad. 

 Voluta mutabilis, Conrad. 

 Infandibuluni perannatum, Conrad, 

 ftlarginella pcrexigua, Conrad. 

 Fleurotoma marylandica, 



Following the coast three or four miles ponth, we observed another vcrtinal clifl', 

 about thirty.five foet in elevation, near Captain Beckett's. The fossils can be traced 

 nearly to the last mentioned locality. At base is a brown mixture of sand and clay, 

 with the same group of shells above mentioned, which aro very numerous in a bed 

 four feet in thickness. Specimens arc difficult to obtain in quantity, as they must 

 be procured in a low cavern liollowed out by the waves. In the next three feet, the 

 same fossils occur, less abundantly ; then succeeds twenty feel of mingled sand and 

 clay apparently destitute of fossils. Above, and resting on this, is a stratum about 

 three feet thick, of quartzoso sand, very mcoherent and filled with shells, among 

 which I rocognised Artemis acelahiilum, Orbicula lugubris, and Pecten Madiso- 

 nius; but the bed being inaccessible without a ladder, the amount of species could 

 not be ascertained. 



Cuff near Beckett's. 

 Ft. in thickness. 



Sand, without shells. 



Sand, with innumerable shells. 



20 



Mingled sand and clay, without fossils, or very rare. 



Same as below, less numerous. 



Sand and clay, with a group of shells like that at Hance's. 



The fos.'iilliferons cliffs of the medial tertiary period extend from hero to the 

 month of Patuxont river. 



Through the kind attentions of Dr. James and Dr. G. Granger Tongue, wo were 

 enabled to make some interesting excursions in the lower part of Calvert county; 

 but 1 regret our limited time allowed us only a rapid glance at the long line of coast, 

 both on the Chesapeake and Patuxont, so replete with interest to the geologint, 

 and so rich in organic remains. Commencing near the southern extremity of Cal- 

 vert, we coasted the Chesapeake, in front of the usual mural escarpment which 

 charactrriies the tertiary clifTs of this region, and wliich continues to the vicinity of 

 Cove Point, where the land slopes gradually to the beach. At the point where we 

 commenced observation, vast quantities of the Turritclla plcbcia, the common spe- 

 cies of .St. Mary's river, appear in veins or thin beds, in clay, just above the level 



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