218 ROCHESTER ACADEMY OF SCIENCE. 



toward the southwest it broadens and gradually attains a height of 25 

 feet and then rapidly decreases in height until it is nearly lost again 

 in the swampy ground. Pursuing its meandering course farther 

 southwestward it gradually broadens and rises to a height of 45 feet, 

 then drops off slightly with hummocky, narrow, meandering crest, to 

 be continued onward in an abrupt rise of more than 40 feet followed 

 by a level stretch and then a further gradual rise of 50 feet to a high 

 elevation that rises about 125 feet above the swamp on either side of 

 the esker. This elevation has a very stony surface, all of the stones 

 being small, and well rounded. The slope toward the west from this 

 elevation is gradual into rolling farm land. The elevation itself is 

 under cultivation, although the esker from the point of origin to this 

 elevation is wooded and bordered by swamps on either hand. 



Southward from this high elevation the esker is very broad and 

 indefinite. On the west is located a large deep kettle, on the east a 

 steep slope leads from the esker crest to the swamp. 



After crossing the road the esker rapidly narrows southwest- 

 ward to its typical form, with hummocky crest, meandering course, 

 and steep sides 60 to 75 feet high. A long deep kettle borders the 

 esker on the west throughout this portion of its course. 



At the second road crossing the esker turns abruptly southward 

 making a right angle with its former course. For the next half mile 

 its course is toward the southeast wnth narrow hummocky crest, 

 meandering course and sides as steep as the materials will lie. All 

 of this southern portion is wooded and bordered by swamps on both 

 sides. About 1,000 feet south of the road just mentioned a ridge 

 extends eastward from the esker that may possibly be interpreted as 

 a tributary. It has a broad crest, with slopes more gentle than those 

 of the main esker, and is under cultivation. Its surface is less stony 

 than the surface of the main esker and apparently is composed 

 largely of till. 



South of this tributary 600 feet, the steep east slope of the esker 

 is succeeded by a gentle slope that passes down to the edge of Men- 

 don pond, the base of this portion of the esker being 500 to 600 feet 

 in width. 



One thousand feet south of this broad i^lace occurs a conical 

 elevation 100 feet high, one of the most conspici:ous elevations of 



