Formation of River Terraces. 



275 



rally received hypothesis that they may have been caused 

 by ice damming back rivers during, or subsequent to, the 

 Glacial epoch. 



Indeed the facts admit of being taken in support of widely 



different conclusions. I repeat, 1st, that the river terraces, of 

 the St. John for example, were formed during the elevation 

 of the carboniferous sandstone, and therefore might be pre- 

 Glacial or not. 2nd. Sometimes a glacier, running down a 



