338 



EARTH FEATURES AND THEIR MEANING 



an advantage in a narrow belt of softer rock along its course, and 

 because of this advantage it captured a portion of one of the tribu- 

 taries to the Farmington (Fig. 367 C). The continental glacier 

 later covered the region, and on its retreat laid down morainal 

 obstructions directly across this river and also at the head of the 

 severed arm of the Farmington tributary (Fig. 367 D). The now 

 impounded waters found their lowest outlet near Sandy Brook, 

 and in waterfalls and cascades the now reversed river falls one 



FIG. 367. Diagrams to illustrate the episodes in the recent history of the Still 

 River tributary to the Farmington in Connecticut. A, present drainage ; B, early 

 stage ; C, after capture of a tributary to the Farmington ; D, after blocking by 

 morainal obstructions of the ice age. 



hundred feet to the bed of that stream. With the aid of the 

 excellent topographic maps which are now supplied by a generous 

 government at a merely nominal price, such bits of recent history 

 may be read at many places within the glaciated region. 



Glacial Lake Ojibway in the Hudson Bay drainage basin. 

 When by passing over the " height of land " in northern Onta- 

 rio the greatly reduced continental glacier had vacated the basin 

 of St. Lawrence drainage, it was in a position to impound those 

 waters which normally drained to Hudson Bay. The lake which 

 then came into existence has been called Lake Ojibway and was the 

 latest of the entire series. Though of but recent discovery in 

 a country till lately a trackless wilderness, its extension seems to 

 have been that of the clay beds suited for farming. The beaches 

 and outlets remain to be mapped when the country has been 

 made more easily accessible. 



