HAMBURG MORAINE. 679 



On the inner slope of the moraine near Orchard Park the lake waves 

 connected with the Belmore beach have formed a marked terrace from 

 which the knolls have been cut away and the depressions filled, but west- 

 ward from Orchard Park down the slope toward the upper beach of the 

 Lake Warren series, the knolls and basins seem to have been modified but 

 little by lake waves. The moraine appears to have extended but little 

 north of the beach, though a few drift knolls were observed a mile or so 

 north of it along the valley of Rush Creek. A small part of the moraine, 

 about 2 miles southwest of Orchard Park, stands as an island above the 

 level of the Belmore beaoh. It covers only about 40 acres, and the road 

 from Abbotts Corners to EUicott passes directly over it. Wave action is 

 very clear on its north and west face, but the south and east are scarcely 

 at all wave-cut. These and other features attending the lake occupancy 

 are more fully discussed in connection with the beaches. 



STRUCTURE OF THE DRIFT. 



This moraine contains a remarkably large amount of gravelly material 

 along much of its course. There is, however, from Hamburg nearly to 

 Orchard Park, a ridge of compact clayey till forming the crest of the 

 moraine. There is also much compact till on the high parts of the moraine 

 between Cazenovia and Biiffalo creeks. Gravelly knolls abound on the 

 inner slope from near Hamburg to Orchard Park immediately north of the 

 till ridge just mentioned, while from Orchard Park to Cazenovia Creek 

 the crest, as well as slopes, is largely a gravelly material. There is an 

 abandoned valley, probably of preglacial age, leading from Cazenovia 

 Creek at East Aurora to Buffalo Creek at East Elma, and tliis is filled with 

 sharp gravelly knolls and ridges, which are markedly in contrast with the 

 gentle till swells on the higher part of the moraine north of this old valley. 

 From Buffalo Creek eastward nearly all the knolls appear to contain gravel, 

 while the low or gently undulating- tracts among them carry a rather 

 stony till. 



OUTER BORDER DRAINAGE. 



The line of escape for glacial waters at the time this moraine was 

 forming was evidently westward into the glacial lake which was bordered 

 by the Belmore beach (Lake Whittlesey). There is a well-defined channel 

 leading from the head of Little Buffalo Creek, in southeastern Marilla 



