REPORT OF THE DIRECTOR I915 I75 



lower figure). North of this breach it is continued as a morainic 

 ridge distant loo yards from the mountain wall. Its top is 20 to 30 

 feet higher than the depression between it and the mountain. This 

 morainic ridge continues northward rising slightly, and is narrow on 

 top. At its north end it slopes down again to meet the south end of 

 a tectonic ledge that continues northward along the same axis at a 

 like height. Along the outer face of this ledge and moraine is to 

 be seen a wave-beaten line of large, exposed rocks. 



Between the ledge-moraine ridge and Buck mountain is a depres- 

 sion of varying width, but of unvarying depth (figure 2, and plate i, 

 lower figure). Its northern portal is from a terrace of stony loam 

 at an altitude of between 560 and 580 feet (United States Geological 

 Survey map) just south of where the old Crown Point Iron Com- 

 pany's railroad bed crosses the highway, and a short distance east of 

 Enos Dudley's house. Its floor is wet and mucky and is clothed with 

 sedges, ferns, hummocks of sphagnum moss and other moisture-lov- 

 ing vegetation. This depression was evidently a marginal channel, 

 and at the breach mentioned above, it broke through the moraine into 

 a marginal lake. Prior to this, and while the ice still lay against the 

 northern portion of the moraine, the marginal stream may have 

 swept over the southern end of the moraine, which, as we have seen, 

 is. flat on its top just south of the breach. This portion is slightly 

 lower than the north end of the channel. When the ice had receded 

 somewhat from the moraine, the marginal stream broke through it, 

 and sweeping between the ice and the moraine's southern end, it 

 formed a subsidiary terrace there. At this level the marginal stream 

 may have flowed both sides of the ridge, uniting at the breach with 

 the portion that flowed in the channel between the ridge and the 

 mountain. This breach in the moraine lies at the head of a modern 

 gully that runs eastward and crosses the highway between the 

 Brooks and Bradford houses. Passing down this gully, the right- 

 hand bank is seen to be composed of heavy morainic stones, while 

 on the left is exposed a cut of gravel, evidently unstratified. 



Gillette and Factoryville Moraines 



In the central part of the embayment occur moraines at a lower 

 level. The Gillette moraine is a knoll lying to the north of the so- 

 called " South road " a short distance east from Renne Corners 

 (see map 5). . It is shown on the contour map with a top rising to 

 over 500 feet. Its south side is skirted by a gentle shore line at the 

 450 foot contour. Its northwest face shows no shore line, but 



