232 ROCHESTER ACADEMY OF SCIENCE. 



Origin. Little can Ije said as to the origin of this esker. The 

 abundance of local material in its composition is antagonistic to the 

 idea of stiperglacial origin. The small amount of sand observed 

 in its course is certainly unfavorable to the idea of origin at the ice- 

 front or within a re-entrance into the ice, for under these conditions 

 a composition comparable to that of kames might be expected. 

 Further it was apparently formed at a time when the Albion moraine 

 with its associated kames was forming at the ice front around Clar- 

 endon south of the southern terminus of the esker. Its width seems 

 to be the only feature opposed to the idea of subglacial origin. 

 "Indian Hill" at the terminus of the esker may very likely represent 

 a kame that was forming at the edge of the ice when the esker was 

 being deposited beneath the ice toward the north in the subglacial 

 feeding stream. 



Ogdcn esker. Three miles south of Adams Basin and one-half 

 mile east of Ogden occur several glacial features that Leverett has 

 interpreted as constituting an esker (62). These features are well 

 exhibited on the Brockport topographic quadrangle. An inspection 

 of this part of the map discloses a broad interrupted ridge trending 

 southwestward, 40 to 60 feet above the general level of the sur- 

 rounding country, with low wet ground on either side. On the quad- 

 rangle this ridge is represented as about one mile in length, 

 however it is in reality twice that length, fully half of it being too low 

 to find representation with the contour interval used. 



The ridge begins on the north as a low broad quite incon- 

 spicuous feature just south of the first east-west road north of 

 Ogden. For one-fourth of a mile it preserves this character, then 

 rises gradually to a height sufficient to take its first 20 foot contour. 

 Just east of Ogden on the cross road the ridge is 50 feet high and 

 one-quarter of a mile wide. It diminishes in height southward from 

 this locality and nearly ceases. Again it increases in height and turn- 

 ing more to the southwest continues to the east-west road one mile 

 south of Ogden. The highest part of this portion of the ridge is 60 

 feet above the surrounding country. It is broad, being nearly one- 

 half a mile in width at this highest point with very gentle slopes. 



Throughout the entire course the ridge is under cultivation. 

 Its surface is sandy, here and there gravel occurs mixed with the 



