1890] 



MARYLAND ACADEMY OF SCIENCES. 



103 



inches in thickness, have become broken into countless small 

 angular pieces, and spread through or upon the soil of fields in 

 almost the entire peninsula, from near Chesapeake Bay to 

 above the head of Severn river. Multitudes of these have 

 been gathered from the fields and placed out of the way beside 

 roads or in fence corners, but vast numbers of them still 

 remain, and point to the presence of layers of rock which once 

 spread over the higher inequalities of the country at the close 

 of the Eocene period. 



The diagrammatic sketch shows the position and thickness of 

 these Eocene deposits on the surface of the other formations, 

 and it indicates the most extensive and thick part of its sand- 

 rock and sands, from a point near Round Bay station, follow- 

 ing the undulations and dip of the upper member of the Creta- 

 ceous, to within one mile from the mouth of the Severn. 



The sections sketched beyond may prove to be of some use 

 in illustrating the descriptions given in the foregoing papers. 



The following section exhibits the thickness and order of 

 succession of the beds as seen in the face of the cliffs on Pis- 

 cataway Creek, beginning a few rods behind Fort Washington 

 and extending about three-quarters of a mile up the creek : 



