232 F\ REPORT OF PROGRESS. E. W. CLAYPOLE. 



Jackson township, and begins to form Chestnut ridge. The 

 sand rock is well shown at this point, and is quarried yield- 

 ing a fair quality of stone. A mile and a half further west, 

 near Centre, Sherman's creek has cut through the ridge 

 and the iron sandstone and lower shale are exposed with a 

 low dip of 15°. Half a mile further west a road passes 

 through making a similar display, but the dip has steepened 

 to 00°. A second gap occurs at a short distance westward 

 where the ridge is again crossed by the creek and a corres- 

 ponding section exhibited. In this way the axis can be 

 traced across the township into Toboyne, where continually 

 rising it brings up the Medina sandstone and merges into 

 Amberson mountain. Along this axis occur the best exhi- 

 bitions of the Clinton rocks in the township. At Beaver- 

 town narrows and the other gaps already mentioned the 

 various beds are distinctly shown. At Bistline's mill, near 

 Andersonburg, the creek side shows a beautiful arch of the 

 Iron sandstone and Ore sandrock with the lower shales be- 

 neath them. Some of these exposures are fossiliferous as 

 that at Beavertown where the upper shales yield abundantly 

 and the lower shales scantily.* 



South of this axis another develops itself in the Clinton 

 shales and brings up the Ore sandstone. This axis is much 

 eroded in Jackson township by several streams which have 

 cut their way through it. 



The Onondaga shale, {No. V.) 



These shales underlie the greater part of the township, 

 including almost all the farming land. They lie along the 

 edges of the Clinton outcrop, but are usually low and 

 covered with soil. They occur in three distinct patches: 



1. The valley between Conecocheague and the end of 

 Limestone ridge. 



2. The broad open plain in the middle of the township. 



3. Shaeffer valley between Bower and the Blue mountain. 



• The account here given of this anticlinal axis differs from its description 

 by Prof. Rogers in his Final Report of 1868. In fact I have found it difficult 

 to follow Prof. "Rogers' description of the axes of Perry county in the field. 

 His details seem in some places incorrect and confused. 





