228 .ROCHESTER ACADEMY OF SCIENCE. 



From the point where this tributary joins the main ridge a road 

 follows the broad crest of the esker until the latter ceases at a stream 

 crossing 600 feet or more beyond this point of junction. The portion 

 from this interruption to the southern terminus of the esker may be 

 regarded as the southern part of the esker. (Figure 14, plate XVI). 

 This southern portion possesses typical esker characters, much more 

 so than the northern portion. Here the esker has a narrow, hum- 

 mocky crest, steep sides, as steep as the materials will lie, and a 

 meandering course. 



In places the esker reaches a height of 50 to 60 feet, however, 

 for the greater part of its course it is but 20 to 30 feet in height. 

 It is continuous, but one short gap occurring and that near its 

 northern terminus. Swamps occur on both sides throughout its 

 whole extent, the ground being much too wet for cultivation ; kames 

 rise from these swampy tracts in several places. 



This portion of the esker has a short low eastern prolongation 

 just south of the east-west road. It continues eastward for 500 or 

 600 feet before gradually disappearing. It is very possibly a small 

 tributary. 



This part of the esker is further characterized by a very broad 

 place in its course. It is flat-topped, several hundred feet across and 

 rises 50 to 60 feet above the base of the esker. The sides have gentle 

 slopes which are scarred by numerous gullies. In the southeast 

 section of this elevated level space occur three large blocks of 

 weathered Medina, the largest of which will measure 10 or 12 feet 

 on its edges, the other two being but little smaller. Other large 

 boulders are lacking on the surface, but gravel occurs everywhere. 



After pursuing a meandering course for nearly a quarter of a 

 mile beyond this broad portion the esker terminates abruptly in a 

 level-topped loaf-shaped hill whose surface is covered by stones of 

 all sizes. All are well-rounded, with crystalline material forming a 

 conspicuous but minor portion, the greater part being Medina. Its 

 sides are as steep as those of the esker ridge proper except the side 

 on the west which slopes more gently toward the road. 



East of the terminal loaf-shaped hill occurs another larger hill 

 with gentle slopes. Its slopes are comparatively free from stones 

 and apparently are of till. It is probably morainal in origin. 



