MARYLAND GEOLOGICAL SURVEY 



105 



Section on Bay Shore .5 mile ^outti, of Dares Wharf. 



a 

 ■M .2 



O -M 



Pleistocene. £ S - 



:-< t-> 

 o 

 fa 



Feet. 

 Variegated cross-bedded sand and gravel 33 



Miocene. 



a 



*J o 



|i 



O o 



Greenish sandy clay 



Total. 



36 



Pleistocene. 



Section on Bay Shore one mile north of Drum Point. 



Feet. Inches. 



a 



+^ 2 



o *-> 



■^ 1=1 , 



fa 



Yellowish loam 2 



Cross-bedded sand and gravel 24 



Coarse gravel 



Slate-colored clay 5 



Peat carrying abundant plant remains 1 



Chocolate-colored clay carrying gnarled and twisted 

 plant stems, full thickness not visible as it passes 



below beach level 2 



Total 35 



6 



6 



ORIGIN OF MATERIALS. 



The sources from which the Sunderland, Wicomico, and Talbot seas 

 derived the materials for their respective deposits were principally con- 

 fined to the Coastal Plain. The waves must have eroded large areas 

 of Cretaceous, Eocene, Miocene, and Lafayette and re-worked the ma- 

 terials into their own deposits. In addition to this, the Wicomico sea 

 had the Sunderland deposits on which to erode and the Talbot sea had 

 both the Sunderland and Wicomico land surfaces from which to derive 

 materials. Wherever the Eocene sands and marls have been used in any 

 considerable quantity, their presence is indicated by 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. 

 8 



