282 H. C. Lewis—Supposed Glaciation in Pennsylvania, 
- the bowlder-bearing clay which cover a great part of Northamp- 
ton County south of the Wind Gap have clearly not come 
through the gap, but from the glacier on the south side of the 
mountain. 
Immediately in front of the gap there is a great mass of sharp, 
frost-broken talus of Medina sandstone, which forms a sloping 
plain leading up to the gap. The rock fragments are not 
rounded or water-worn, but angular and often of large size. I 
am led to believe that all this work was accomplished long 
course of atmospheric influences. Had a stream flowed through 
it in recent times, the talus would have been carried off an 
the sides of the gap become steep, as at the neighboring Dela- 
ware and Lehigh Gaps. 
e very floor at the bottom of a narrow valley. Had the 
re 
stances, we have the moraine crossing the valleys of Fishing 
Creek, Columbia County ; Great Valley Creek, Cattaraugus Co., 
N. Y.; the Susquehanna, Allegheny, Conewango, and Beaver 
Rivers. The evidence gathered from the conditions, on these 
and many other streams, is all opposed to any theory that the 
Wind Gap was made either by glacial waters or by ice. 
(4.) The same arguments, that have been used in referring 0 
the Wind Gap, are just as appropriate in considering the extra- 
ordinary hypothesis proposed to account for the Bake-oven. 
There is the strongest proof of the absence of all glacial action 
at this place. I find no evidence that the glacier approached 
the Bake-oven nearer than twenty miles 
(5.) The Lehigh River was one of the great waste-weirs of 
the melting glacier. All the way from Hickory Run, where 
4 Proc. Acad. Nat. Se., 1880. 
