1G4 F 3 . REPORT OF PROGRESS. B. W. CLATPOLE. 



They are for the most part small ledges in the fields broken 

 up by the plow. Some of them are very fossiliferous and 

 have yielded most of the species found on this horizon in 

 other parts of the county with some not yet met with else- 

 where. The shale has apparently its usual thickness. 

 Along the place of this outcrop in the south side of the 

 syncline I have not seen any exposure but have no reason 

 to suppose that it is not present. The two formations above 

 the Hamilton sandstone next to be mentioned, though thin, 

 are so far as I have observed persistent. 



The Genessee, Portage and Chemung. 



The shales of these groups are exposed in Carroll town- 

 ship along their expected line of outcrop, especially on the 

 north side of the syncline. The characteristic fossils of the 

 Portage shales may be found near an old mill on the south 

 side of the road, about a mile from Drumgold's tannery. 

 The shales present here their usual dark color and cross- 

 fracture and apparently are of their usual thickness. 



The Chemung shales cover a great extent of ground in 

 this township, their outcrop forming a belt more than a 

 mile wide from Rattlesnake hill to Mount Pisgah, and 

 thence east to the line of Rye township. Their thickness 

 is intermediate between that of the same group near Mil- 

 lerstown and near Marysville. In the western part of its 

 outcrop this does not exceed 2700 or 2800 feet, about three 

 times its amount at the Susquehanna gap. Their surface 

 presents the usual rounded hillocks and poor soil without 

 any geological features calling for farther notice. 



TJie Chemung-Catskill beds and Catskill group. 



The middle of the syncline in Carroll township is occupied 

 by t lie red sandstones and shales of this group, mostly 

 with ;i low angle of dip and curving gradually around to 

 return eastward to the Susquehanna along Fishing Creek 

 valley. They show none of rlie thinning out that marks 

 those of the Chemung in the southern and southeastern 

 pari of the county, and their outcrop consequently under- 

 lies a wide tract of country. The rocks dip south-southeast 



