Maryland Geological Survey 



31 



RELATION OP THE DEVONIAN FORMATIONS OF MARYLAND TO THOSE 

 OF PENNSYLVANIA, NEW YORK AND NEW JERSEY 



Maryland Pennsylvania! | New York^ 



New Jersey' 





Catskill formation 



Catskill formation 



Catskill formation 







Jennings 

 format' n 



Chcmimg 

 member 



Chemung formation 



Skunnemunk 

 conglomerate 



c 







Parkhcad 

 member 



.1 S 



Enfield member 





1 



Is 



li 



Ithaca 

 fauna 



Portage formation | ■£ S 



Ithaca member 





Naples 

 fauna 



Sherburne 

 member 



Bellvale shale 





Genesee 

 member 



Genesee formation | Genesee formation 





c 



Romney 

 format'n 



Hamilton 

 member 



Hamilton formation 



Hamilton formation 



Monroe shale 



g 



Marcellus 

 member 



Marcellus formation 





■3 



Onondaga 

 member 



Marcellus formation 



Onondaga formation 



Newfoundland grit 



S 



Onondaga limestone 





Oriskany 

 format'n 



Ridgely 

 niembe r 



Oriskany formation 

 Stormville shale 



Oriskany formation 



Oriskany sandstone 





Shriver 

 member 



Port Ewen formation 



Kingstone shale 





Helder- 

 berg 

 format'n 



Beeraft 

 member 



Beeraft formation 



Beeraft limestone 





Lower Helderberg 

 formation (upper 

 part) 





NewScotl'd 

 member 



New Scotland 

 formation 



New Scotland lime- 

 stone 





Coeymans 

 member 



Kalkbcrg formation* 



Stormville sandstone* 



.2 



Coeymans formation 



Coeymans limestone 



S 



Keyser 

 member 



HartnageF 



Ulrichs 





3 



Manlius«of 

 east'nN.Y. 



Transi- 

 tion beds 









Rondout 



Rondout 



Rondout cement beds 





Cobleskill 



Decker 

 Ferry 







Rosendale 



Decker Ferry lime- 

 stone 





Wilbur 





1 Lesley, 2d Geol. Surv. Pa., Final Report, vol. ii, 1892. 



- Hartnagel, N. Y. State Mus., Handbook No. 19, 1912. The Upper Devonian is compared with the 

 section near Ithaca, N. Y. See discussion elsewhere in this volume. 



3 Weller, Pa!. N. J., vol. iii, 1903. 



« The equivalence of the Kalkberg and Stormville sandstone is not here affirmed. 



= Hartnagel and Ulricli prrsfiit divergent views concerning the correlation of the formations lying 

 below the Cocym.ins in \i v Y.,rl:, Tlip reader is referred to the chapter upon the correlation of the 

 Helderberg for a (liscn^- h,;, ni ;ir : hii'ct. 



•Hartnagel aiiJ Will, t .. i : lormation to be Upper Silurian. Ulrich believes the Decker 

 Ferry and overl.i inu .-11 Hi ... ■ I...... Uivonian. 



