DRIFT PHENOMENA IN WISCONSIN I 37 



area shown on the map. Throughout the whole of this course 

 the marginal ridge lies on the south slope of the Nose, and has 

 the asymmetrical cross section shown in Fig. 4 ; above (north of) 

 the ridge at most points not a bowlder of drift occurs. So 

 sharply is its outer (north) margin defined, that at many points 

 it is possible to locate it within the space of less than a yard. 



At the crest of the Nose [b Fig. 2) the marginal ridge, without 

 a break, swings northward, and in less than a quarter of a mile 

 turns again to the west. Bearing to the north it presently 

 reaches (at ^) the edge of the precipitous bluff, bordering the 

 great valley at the south end of the lake. Between the two 

 arms of the loop thus formed, the surface of the Nose is so 

 nearly level that it could have offered no notable opposition to 

 the progress of the ice, and yet it failed to be covered by it. 



In the valley between the east bluff and the Nose, the ter- 

 minal moraine lies further west than on the elevations. The ice 

 moved against the Nose from the east, and mounted to its highest 

 point, but in this achievement it so far spent its strength as to 

 be unable to continue, even over the comparatively level surface 

 beyond. Divided by the Nose as by a wedge, it moved west- 

 ward over the lower land on either side, but failed to occupy the 

 intervening crest of the ridge. 



In the great valley between the Nose and the east bluff, the 

 marginal ridge does not appear. In the bottom of the valley the 

 moraine takes on its normal form, and the slopes of the quartzite 

 ridges on either hand are much too steep to allow any body of 

 drift, or loose material of any sort, to lodge on them. 



Ascending the east bluff a little east of the point where the 

 drift ridge drops off the west bluff, the ridge is again found (at 

 {£) in characteristic development. For some distance it is located 

 at the edge of the precipitous south face of the bluff. Farther 

 on it bears to the north, and soon crosses a col (?) in the ridge, 

 building it up many feet above the level of the bed rock. Here 

 again, as on the Nose, the ice that had surmounted the elevation 

 had spent its strength and was unable- to move forward, even 

 thousfh forward movement would have been down grade. 



