Proc. Roch. Acad. Sciknce. 



Yin,. r>, Pr,. IV 



A. 



LAKE 

 DAWSON. 



Map A. Lake Dawson stage, showing the waning glacier and the subglacial 

 esker-river constructing a "fan" at the ice margin ; also the "fan" pre- 

 viously built in primitive Dawson when the ice front was at the broken 

 line. Still earlier the ice had stood at and constructed the Pinnacle 

 Range of hills. Outlet of lake is to southeast. 



