382 THE ICE AGE IN NORTH AMERICA. 



posits come down on the rocky shelf bordering the Hurri- 

 cane in a way to show that it could not have remained where 

 it is during the time required for so small a stream to wear 

 down so large and deep a channel. 



The extension of Teazes Valley, after merging for a 

 short distance with the Ohio, really continues back of Ash- 

 land, Ky., on the south side of the river, down as far as 

 opposite Hanging Rock in Ohio, in all a distance of about 

 sixty miles. 



Among other decisive instances discovered by Professor 

 White, and bearing on the recent date of these high-level 

 terrace deposits, are the following : 



About ten miles above the mouth of the Big Sandy River, 

 and on the West Virginia side, a considerable deposit of small 

 water- worn bowlders occurs near the summit of a broad, flat- 

 topped hill, at an elevation of four hundred feet above the 

 stream, or not far from nine hundred feet above tide. This 

 deposit is interesting from the fact that it is the only one that 

 I was able to find between the point in question and the source 

 of the river, nearly two hundred miles above, though the fail- 

 ure may be satisfactorily accounted for in the precipitous char- 

 acter of the bounding valley-walls, and the unusually soft and 

 easily disintegrating nature of all the surface-rocks ; for along 

 the Big Sandy even the Pottsville conglomerate becomes rot- 

 ten, and very readily crumbles into loose sand, which, carried 

 down by the rain, fills up the channel of the river, and has 

 thus given name to the stream. It is not assuming to state 

 that these rounded bowlders of local coal-measure sandstone 

 could hardly have resisted the elements during the long time 

 since the Big Sandy Valley existed at this 400-foot level. 



The Guyandotte River puts into the Ohio next above the 

 Big Sandy, and on this stream, about one hundred miles above 

 its mouth, a large deposit of rounded bowlders was observed 

 on the inner side of one of its great curves opposite the mouth 

 of Panther Creek. The bowlders cease at 150 feet above the 

 stream, or about 925 feet above tide, according to levels run by 

 Captain Miller, of the Trans- Flat Topland Company. The 

 bowlder-deposits are found in greatest quantity about the 



