DRUMLINS OF WESTERN NEW YORK. 691 



WESTERN NEW YORK DRUMLIN BELT. 

 DISTRIBUTION. 



The extent of the drumUn belt from the Greuesee River westward 

 to Niagara River is well shown on the Rochester, Brockport, Albion, 

 Medina, Lockport, and Tonawanda topogTaphic sheets, incorporated in 

 PI. Ill, the contours of the oval-shaped hills being a sufficient means for 

 identification. The drumlins are all situated in the district between the 

 Corniferous and Niagara escarpments.^ It will be observed that in the 

 Rochester quadrangle the drumlin belt crosses to the west side of the 

 Grenesee below Scottsville, and nearly occupies the interval of 7 miles 

 between Aliens Creek and Black Creek; on the Brockport quadrangle 

 the south border lies near Aliens Creek, while the north border is 6 

 to 8 miles farther north, being generally about 2 miles north of Black 

 Creek; in the Albion quadrangle it lies mainly in the northern townships 

 of Genesee County (Bergen, Byron, Elba, and Oakfield), but extends 

 southward into Stafford Township, in the vicinity of the New York Cen- 

 tral Railroad; in the Medina sheet it is represented in only a few small 

 drumlins on the south side of Oak Orchard Swamp, in Oakfield and 

 Alabama townships. There is an interval of about 15 miles in which no 

 drumlins occur; but near Raymond, south of Lockport, there is a group 

 of three drumlins; and near Pendleton Center, a few miles farther west, 

 there is a similar group, and still farther west, near Tonawanda, an 

 occasional low drumlinoid ridge. 



Where best developed the drumlins occur at intervals of one -half mile 

 to a mile, and there is usually a nearly plane surface among them, but 

 where they are poorly developed the drift among the drumlins is liable to 

 be aggregated in knolls of irregular shape, often bearing no resemblance 

 to drumlins. The drumlins prevail to the exclusion of other drift knolls 

 only in very limited areas. It will be observed that they are most 

 abundant in the northern and eastern parts of Elba Township, Genesee 

 County, and thence eastward 'along the borders of Black Creek to the 

 Genesee River. In the southern part of the drumlin belt there are many 

 small drift knolls and ridges which do not appear on the topographic 

 sheets, but which tend to give the surface a morainic appearance. The 



^A few drumlins near the mouth of Genesee River do not fall in the belt under discussion. 



