Shorelines of Oberlin Quadrangle 
359 
this lake stage, probably account for the scanty shoreline develop- 
ment. 
Grassmere Stage. About one-quarter of a mile south of Avon 
Station, a low sandy ridge, approximately 80 rods in length, is the 
only beach structure, belonging to this stage, found east of the Black 
River. Coincident approximately with the correct altitude for this 
shoreline, the clay of the till has been removed, concentrating the 
bowlders. Between Black River and North Amherst the fields show 
a sandy soil, but nowhere was a beach form noted. West of Beaver 
Creek, commencing near its bank, a broad low sandy ridge, about 100 
rods in length, crossed by the first north-south highway west of North 
Amherst, is the last evidence of the Grassmere shoreline noted on this 
quadrangle. The conditions suggested above for the slight develop- 
ment of the Elkton shoreline probably hold also in the case of the 
Grassmere. 
Lake Wayne 
Commencing on the east side of the Oberlin quadrangle this 
stage is marked by a low sandy beach as far west as Avon. North of 
Avon Center, the northernmost of the beaches which are associated 
with the cuspate foreland, belongs to Lake Wayne; the margin of 
this foreland has been subject to wave-erosion, as shown by the fact 
Fig. 3. Bowlder strewn area along the Wayne shoreline northeast of Avon 
Center. 
that the Berea sandstone for three-eighths of a mile is quite bare, and 
the fields contain numerous glacial boulders (Fig. 2). Between 
French Creek and Black River the shoreline consists mostly of a 
cliff cut in the fissile shale. Lying a few rods north of the front of this 
