88' THE PLIOCENE AND PLEISTOCENE DEPOSITS OP MARYLAND 



ferruginous conglomerate used in the wall about the grounds of St. 

 Elizabeth's Asylum were obtained from this consolidated Sunderland 

 material. The coarser materials are frequently much decayed. 



A fossil bed bearing carbonaceous matter containing recognizable plant 

 remains occurs at Point of Bocks and a similar deposit has been dis- 

 covered not far from Owings Station on the Chesapeake Beach Railroad. 

 From this latter locality no remains capable of identification have been 

 secured. It consists of a stratum of black clay about 3 feet in thickness, 

 in which numerous small lignitized stems have been imbedded. 



The sources from which the Sunderland sea derived the materials for 

 its deposits were principally confined to the Coastal Plain. Its waves 

 must have eroded large areas of the Potomac and Lafayette formations 

 and re-worked their materials into its own deposits. Wherever the 

 Eocene sands and marls have been used in any considerable quantity, 

 their presence is indicated hy a peculiar greenish color imparted to the 

 deposit. Miocene materials cannot be so readily detected, but they were 

 nevertheless re-worked in large quantities. The rivers also brought in 

 contributions from the Piedmont Plateau and the mountains of western 

 Maryland. This material was pushed along the bottom, drifted in 

 suspension and floated along on ice-blocks. 



Section on Bay Shore Two Miles South of Cove Point. 



Feet. Inches. 



Pleistocene. Sandy loam 3 



Sand and gravel 20 



Iron layer 3 



Fine white and red sand 3 6 



Drab clayey sand 1 



Reddish sand 6 



Drab clayey sand 1 



Fine white and red sand 3 6 



Drab clay 8 



Fine sand 6 



Drab clay 3 



Red sand 2 6 



Iron layer 2 



Miocene. Fossiliferous sandy clay 54 



Total 96 7 



