176 The Lower Devonian Deposits of Maryland 



Vertical Total 

 thickness vertical 

 feet thickness 

 Leptcnna rhomboidalis, Strophonella leavenworthana, S: punctu- 

 lifera, 6; Meristella sp., Dalmanella sp., 4; Gypidula coeyma- 

 nensis, Actinopteria communis (?), Stropheodonta planulata, 

 Atrypa reticularis, Spirifer cyclopterus, Vncinulus nucleolatus ? 

 at base 9.2 9.2 



Thickness of Coeymans member. 



Till. Section near Warren Point 



Cove, or Tuscarora Mountain, is an anticline whose harder beds pass 

 beneath the surface about a mile south of the Maryland-Pennsylvania 

 boundary. Licking Creek cuts through its southern end almost on the 

 State line, about 8 miles northeast of Hancock. At this place one of the 

 finest sections of Upper Silurian and Lower Devonian rocks of this region 

 is exposed. By following the road west of Warren Point along Licking 

 Creek, the Tonoloway, Helderberg, and Oriskany are finely exposed while 

 the Clinton outcrops on the south bank of the creek a little farther west. 



The Lower Devonian undergoes a rapid change between Hancock and 

 Warren Point. At Hancock the divisions still show many of the char- 

 acteristics observed in the Cumberland area. At Warren Point the Oris- 

 kany is greatly reduced in thickness, being only 52 feet thick instead of 

 over 400 feet thick as at Tonoloway, and its lithological and f aunal char- 

 acters are greatly changed. The Becraft, absent west of this place, 

 appears in force, the New Scotland and Keyser become thinner while the 

 Coeymans is a sandstone. All of these features indicate differences in the 

 conditions of sedimentation. 



The following section is exposed on the south side of Licking Creek 

 beginning at the iron bridge and extending westward.^ 



Oriskany Formation 



Cherty arenaceous limestone. Spirifer arenosus, S. murchi- 

 soni, Meristella lata, Rensselwria marylandica. 



^ Measured by R. B. Rowe. 



