304 P. REPORT OF PROGRESS. E. W. CLAYPOLE. 



of Limestone ridge is very marked. The beds are thin, and 

 at the few exposures at the east end of the township show 

 only a small part of the section. 



But at the west end near the border of Saville township 

 occur the best exposures of the white flint beds that I have 

 seen in the county. Near School-house No. 8 can be seen 

 the section here represented : 



Solid white flint, 0' 0' 



Solid white flint, 0' 6'' 



Solid white flint, ... 1' 



Sandy limestone with lenticular black flint masses, .... 4' 

 Sandy limestone as at Half Falls mountain, 6' 



The exposure of these rocks in this part of the township 

 is much increased by three anticlinal rolls, which are repre- 

 sented on the county maps by the zigzags of the color bands. 



The Oriskany sandstone, JVo. VII. 



This sandstone makes but little show in Tuscarora town- 

 ship, and calls for no lengthened description. A fair ex- 

 posure of it occurs opposite Millerstown. 



The Marcellus group, {VI II.) 



No exposure of the Marcellus limestone or Iron ore has 

 been found in Tuscarora township. It appears as if this 

 bed of hematite were less developed in this part of the 

 county than in the center. Nor have I observed any out- 

 crops of the Black shale calling for special mention. All 

 the features of these rocks may be found described in the 

 reports on other townships. 



The Hamilton group. ( VIII.) 



The lower shales of this group like so many others are in 

 great part covered with forest. The sandstone, however, 

 nexl to Tuscarora mountain, forms the most conspicuous 

 object in the township — Raccoon ridge. This, as most 

 others made of the Hamilton sandstone, is a steep, rough, 

 wooded range forming an almost impassable barrier from 

 end to end through which only two roads exist. One of 



