SIGNS OF PAST GLAGIATIOX. 



63 



in Pennsylvania. One of the most interesting of these is 

 on the hills in Kentucky, about twelve miles south of the 

 Ohio Eiver, at Cincinnati, where I discovered boulders of 

 a conglomerate containing many pebbles of red jasper, 

 which can be identified as from a limited formation crop- 



Fig. 25.— Conglomerate boulder found in Boone County, Kentucky. (See text.) 



ping out in Canada, to the north of Lake Huron, six 

 hundred or seven hundred miles distant. That this was 

 transported by glacial ice, and not by floating ice, is evi- 

 dent from the fact that here, too, there was no barrier to 

 the south, requiring deposits to cease at that point, and 

 from the further fact that boulders of this material are 

 found in increasing frequency all the way from Kentucky 

 to the parent ledges in Canada. With reference to these 

 boulders, as with reference to those found on the summit 

 of Mount Washington, we can reason, also, that any 

 northerly subsidence permitting a body of water to occupy 

 the space between Kentucky and Lake Superior, and deep 



