E. C. Case—AmphiMan Fcmna at Linton^ Ohio. 127 



in Beaver County, Pennsylvania (3), then east to near the 

 mouth of the Beaver Kiver in Beaver County (2) and 

 southeast to Sewickley in Allegheny County, Pennsyl- 

 vania (1), the Upper Freeport Coal maintains a nearly 

 uniform thickness of 2 to 3 feet underlain by a vary- 

 ing thickness of fire clay with a thin limestone at 



Fig. 1. 



Fig. 1. Map showing the location of Linton, Ohio and the stations from 

 which sections are quoted. 



stations 4 and 2. Beneath this is a considerable thickness of 

 sandy shales broken at station 1 by thin beds of sandstone and 

 fireclay. The Lower Freeport Coal is very thin at these 

 stations, represented by a carbonaceous slate only at station 1. 

 Below the Lower Freeport Coal lie from 10 to 20 feet of sandy 

 shales and then a heavy bed of massive sandstone, 50 to 75 

 feet, which at station 1 becomes a micaceous sandstone broken 

 by the Upper Kittanning Coal. 



South from Sprucevale (4) the Upper Freeport Coal is 3 feet 

 thick at Linton (5), underlain by fire clay but the limestone is 



