STAGES OF DEVELOPMENT 



21 



The Naugatuck thus 

 acquired more and 

 more of the territory 

 of the latter stream, 

 until the trunk was 

 tapped and the upper 

 waters diverted to 

 itself. The new stage 

 of the river's history 

 thus inaugurated , 

 and also the con- 

 ditions during the 

 preceding stage, are 

 illustrated by the sec- 

 ond and the first dia- 

 grams respectively of 

 figure 2. 



The reversal of the 

 drainage in the Still 

 valley seems here to 

 have been brought 

 about by the drift ob- 

 structions thrown up 

 during the Glacial 

 period. Barriers of 

 this kind have been 

 observed at the pres- 

 ent divides separat- 

 ing the Naugatuck 

 and Mohawk drain- 

 ages from that of the 

 Still. The narrow- 

 ing of the Still-Naug- 

 atuck valley north of 

 Daytonville shows 

 two channels sepa- 

 rated by an island of 

 gneiss. The western 

 channel is filled with 

 an accumulation of 

 gravel, and boulders, 

 which partakes of the 



