374 F\ REPORT OF PROGRESS. E. W. CLAY POLE. 



limestone breccia, the fragments of which are subangular 

 connected by limestone. The fragments consist apparently 

 of the more solid beds of limestone broken down and re- 

 cemented. 



There is also a bed containing great numbers of small 

 quartz geodes in yellow shale. It may be remarked in pass- 

 ing that similar beds occur in the Niagara limestone in Ohio. 



The same series of beds with the same fossils is exposed 

 on the Valley road near Cissna's run or Cedar run in Madi- 

 son township. See report on that township. 



The Lower Helderberg limestone, No. VI 



Three points of this limestone project from Spring into 

 Tyrone township. The first is the point of Bell's hill near 

 Greenpark, the second is the double pointed ridge overlook- 

 ing Landisburg, and the third is a small point west of Oak- 

 grove furnace. 



At the second of these some of the fossils of the limestone 

 shales occur chiefly in loose slabs. Most of them belong to 

 species found at Clark's Mill. (See page — .) 



Another outcrop of this limestone is on the north border 

 of the township along Limestone ridge, the crest of which 

 is the township line. It is long and narrow, and cultivated 

 in most places to the top. 



These outcrops yield an abundant supply of lime for the 

 inhabitants of the township, but they present no features 

 of special geological interest and call for no further remarks. 



The Oriskany sandstone, No. VII 



Only the faintest traces of the Oriskany sandstone are 

 discoverable in the township, except along the northern 

 (Saville) line. Slight indications of the cap of Oriskany 

 may be Been on the two hills above Landisburg, but none 

 on the point of Bell's hill. It is seen again on the top of 

 the knoll facing Oakgrove furnace where the long line from 

 Half Palls mountain meets that coining in from Carroll 

 township. 



