ESKERS IN THE VICINITY OF ROCHESTER, NEW YORK. 223 



resulting strong development of the esker ridges north of the knolls 

 and the upward trend of their crests toward these knolls are in 

 line with this idea. 



Esker south of Mendon kaine area. A third esker occurs be- 

 yond the southern extremity of the Mendon kame area, shown on 

 the Honeoye topographic quadrangle.. It has been described by Pro- 

 fessor Fairchikl (34). He says : "One mile south of the kame area 

 occurs a singular group of knolls that must be regarded as an esker. 

 This lies one-half mile south of Mud pond and three-fourths of a 

 mile west of Mendon center. The north end of the esker is cut by 

 the east and west highway. This esker consists of four connected 

 knolls, in a north and south line, making altogether a length of about 

 one-eighth of a mile. The local name of the knolls is the 'Dumpling 

 Hills.' The summit and slopes of the ridge and the road cutting- 

 show only a fine, stifif or silty sand, similar to much of the surface 

 of the region southward. -A few stones were observed in the sand. 

 The esker is thirty to fifty feet high but surmounting a ridge prob- 

 ably drumloid, it is conspicuous over a considerable area. Its alti- 

 tude is 762 feet (aneroid). The sides of the esker are very steep 

 and ridges of sand stretch away from it at right angles" (34). 



Origin. These knolls probably represent deposition at the edge 

 of the ice or within a re-entrant by a heavily laden stream flowing 

 from the ice. They may best be interpreted as a series of kames 

 that have been connected by deposition, the individual kames repre- 

 senting successive halts in the ice retreat with resulting localization 

 of deposition, the connecting ridges indicating slow continuous 

 retreat of the ice front between the periods of halting. 



Le Roy esker. Figure 12. The LeRoy esker lies in Genesee 

 County, situated partly in the town of LeRoy and partly in the town 

 of Stafiford. It is about one-half mile north of the main or State 

 road that connects the village of LeRoy with the city of Batavia, and 

 is crossed by the north and south highway forming the boundary 

 between the two towns mentioned. It parallels in a general way 

 both the New York Central Railroad (Batavia and Canandaigua 

 Branch) and the Erie (Attica Branch), and lies about half way 

 between the two. The northeastern part of the Batavia topographic 



