440 FRANK BURSLEY TAYLOR 
takes place the bowlders in the channel may be gathered up and 
transported some distance and finally be deposited on or in a 
rugged hilly moraine even to its topmost parts. In being car- 
ried forward the bowlders may be more or less dispersed, or 
they may be concentrated, or neither of these effects may appear. 
In each case it depends mainly upon the relation of the river 
Maumee 
Lake 
Decatur B 
Fic. 3. Showing relation of the Whitley bowlder belt to the Wabash-Erie channel. 
channel to the direction of ice-motion. If the channel were 
straight and also normal to the ice-front the readvancing ice 
would carry the bowlders all forward down the channel and con- 
centrate them in a pile where it stopped. If the channel lay 
athwart a pointed ice-tongue and close in front of it, the read- 
vance would disperse the bowlders somewhat. There is a bowl- 
der belt in Whitley and Huntington counties, Indiana, which 
may be due to partial concentration by a readvance diagonally 
across the bed of a great river corresponding to the stream that 
