IS. TYRONE TOWNSniP. F 2 . 373 



The red shale saddles all the anticlines as shown on the 

 map. A tongue of it enters the township at Waggoners 

 mill and extends beyond Loysville. A second comes in 

 from the anticline of Bower mountain ; a third from that of 

 Pilot knob, and a fourth from Welsh hill. Skirting all these 

 on north and south is a broad belt of the variegated shale 

 which runs high up the valleys, occupying a broad tract in 

 the middle of each. It may be traced in Kennedy's and 

 Shaelfer's valleys for several miles. The gray shales are 

 eroded from every part of the township except along the 

 border of the limestone. 



The Bridgeport sandstone (of which a description may 

 be found in the account of Spring township) crops out in 

 numerous places in Tyrone, especially on the sides and tops 

 of the shale rido-e in Kennedy's vallev and Green vallev. 

 Here it forms rough, rugged terraces, and its flinty frag- 

 ments cause much labor in clearing some of the fields. X ear- 

 Mr. Egolfs saw-mill, in Tyrone township, is perhaps one 

 of the best exposures. The sandstone has been deeply 

 eroded by McCabe's run and its ragged edges stand out dip- 

 ping at about 45° X. X. W. on the north bank. It is about 

 12 feet thick. 



The variegated shales are well seen on the banks of Sher- 

 man's creek a mile and a half southwest of Loysville. About 

 800 feet of the upper or more calcareous beds are here visi- 

 ble in the middle of the troughs between Bower mountain 

 and Chestnut ridge. The limestone bands are very thick 

 and heavy. One of them has been quarried and burned for 

 lime. This is the most easterly lime quarry on these beds 

 in Perry county. 



The calcareous beds, except those near the base of the 

 section, yield two well-known fossils of the Lower Helder- 

 berg — Leperditia alia and Beyrlchla notata — abundantly. 

 The former may be found almost to the bottom of the ex- 

 X>osed section or nearly 000 feet from its top, thus carrying 

 the crustacean fauna of the Lower Helderberg deep down 

 into the shale, at least as far as the calcareous beds ex- 

 tend. 



A curious bed occurs at the same place consisting of a 



