38 



The Upper Ceetaceous Deposits of Maryland 



J3 

 O . 



P5-* 



CO 



Green sand. 



UPPER SECONDARY. 



Red clay. 



Wm. B. Clark. 

 1894 et seq. 



Monmouth. 

 Matawan. 

 Magothy. 

 Raritan. 



3>" 

 X CO 

 O CO 



H 



Green sand 



and 

 Micaceous 

 black sand. 



N. H. Darton, 

 1891-4. 



Severn. 



Magothy. 



Potomac (in part). 



o 

 S « 



^ CO 



02 



Middle. 



CRETACEOUS 

 GROUP. 



Lower. 



P. R. Uhler, 

 1872. 



Cell marl. 

 Loose marl. 

 Mottled sands. 

 Clay sand. 

 Black marl. 

 Alternate clay sands. 

 Albirupean. 



B 



o 

 -^ 



3d 



^ CO 



r=i CO 

 6 



ai o 



3 -,-1 



■- s 



-> o 

 u 



03 



P. T. Tyson, 

 1860. 



3 

 o 



<D 



cS 



aj 

 i-, 



o 



s 



3 



C 



c 



J- 

 03 



Secondary. 



Charles Lyell, 

 1843-5. 



Cretaceous. 



