Explanation of Plate VIII. 



The plat roughly represents the vicinity of the Concannon house, and 

 was made from sketches taken in the field. 



a) The ridge which rises southward from the Concannon house, 

 and is shown also in PI. IX. 



b) The ridge which rises northward and is also shown in PI. XL, 

 fig. 1, to the right. 



c) The entrance to the cave, from which the cave extends southward 

 to a point west of the Concannon house. 



d) The talus, low and of limited extent, which was evidently formed 

 by slipping from b. 



e) Carboniferous exposure at base of bank, along south side of 

 streamlet. 



The position of the R. R. , the tributary streamlet, the Concannon 

 house, etc. , is also shown. 



