MIDDLE AND UPPER DEVONIAN OF ROMNEY REGION 17 



In the above fauna, Dalmanella lenticularis (Vanuxem) is con- 

 fined to the Onondaga formation; Cyrtina hamiltonensis Hall 

 occurs in the Onondaga, Hamilton, and Portage; Amhocoelia 

 umbonata (Conrad) from the Onondaga to the Chemung inclusive; 

 Styliolina fissurella (Hall), southern Onondaga shale, Marcellus, 

 Genesee, and Portage black shales; Phacops cristata Hall, Oris- 

 kany of Ontario, elsewhere the Onondaga. 'These species all 



Fig. I. — Hanging Rock, West Virginia, where the South Branch Potomac River 

 has cut through Mill Creek Mountain. The rock cliff is Oriskany sandstone. 



occur in the shales from Pennsylvania across Maryland and the 

 Virginias which Dr. Kindle has correlated with the Onondaga of 

 New York,^ and since they came from the same stratigraphic 

 horizon — -the lower part of the Romney shale not far above the 

 Oriskany sandstone — -it appears that this part of the Romney ought 

 to be correlated with the Onondaga. This correlation is in agree- 

 ment with Dr. Kindle's statement that "the Onondaga shale 



^Journal of Geology, XIX (1911), 97; United States Geological Survey, Bulletin 

 508, 1912; and Maryland Geological Survey, Middle and Upper Devonian, text (1913), 

 pp. 48, 49, and 53-59- 



