86 



THE GEOLOGY OF CALVERT COUNTY 



Conus diluvianus, Surcula engonata, Fiilgur fusiforme, Turritella varia- 

 bilis, Panopea goldfussi, Callocardia sayana, Venus campechiensis var. 

 mortoni, Isocardia fraterna, Phacoides anodonta, Pecten madisonius, 

 P. jeffersonius, etc. 



LOCAL SECTIONS. 



While instructive and important sections are found in the valleys of 

 the Potomac and Patuxent rivers and along many of the rivers of the 

 Eastern Shore, the most complete section of the Miocene deposits along 

 the whole Atlantic Coast occurs in the famous Calvert Cliffs from 

 Chesapeake Beach southward to Drum Point. Throughout this distance 

 the bluffs yield a complete sequence of the various beds of the formations, 

 and the fossils are numerous and usually very well preserved. The 

 detailed description of some of these sections will now be given. 



Miocene. 



Eocene. 



"3 a 

 fa 



I. Section on a southern branch of Lyons Creek. 



-1 r-1 -< 



Feet. 



White diatomaceous clay (Zone 3) 



White sandstone containing following fossils : Ecphora 

 tricostata, Panopea whitfleldi, P. americana, Corhula elevata, 

 Phacoides contractus, Tencricardia granulata, Astarte cunei- 

 formiSj A. thomasi, Thracia conradi, Pecten madisonius, P. 

 humphreysii, Chione latilirata, Cytherea staminea (Zone 2) . 

 ^ Brown sand containing Lucina contracta (Zone 1) 



Greenish gray sandy clay 35 



Total 47 



IL Section at Fuirhavcn, one-half mile soutn of icharf. 



o a 



i) o 



Pleistocene, o g - 



o a 



Gravel, sand, and clay. 



Feet. 

 . 10 



Miocene. 



a 



*J o 

 u S 



(■ Diatomaceous sandy clay bleached to a whitish color, jointed 

 so as to have a rough columnar appearance carrying Pha- 

 coides contractus (Zone 3. in part) 24 



Diatomaceous greenish sandy clay breaking with conchoidal 

 fracture, carrying Phacoides contractus and bearing rolled 

 and reworked fcsslls from Eocene in lower 2i^ feet (Zone 3, 

 in part) 36 



Total 70 



