The Abandoned Shorelines of the Oherlin Ouadrang,h\ Ohio in 



Electric line, about one-half mile south of the northern boundary of 

 Elyria township, I have mapped two areas of Whittlesey gravels. 

 The eastern one lies between the 690 and 700-foot contours, accord- 

 ing to the map. It is quite certain that the sketching on the topo- 

 graphic map is in error at this point. The Whittlesey structures 

 here shown are spits of rather coarse materials, built from an island 

 outlier of Berea sandstone the shape of which is roughly shown 

 by the 700-foot contour. This outlier has a long east-west axis. 

 According to the hand level its top is approximately on a level with 

 the "Lake" road, one-half mile southwest— i. e., the altitude of the 

 outlier is about 730 feet. From its southwestern corner another spit 

 of coarse gravel material was developed; these gravels terminate 

 near the Wheeling track. Apparently a wave-cut cliff once showed 

 entirely across the north side of the island, where a quarry is now- 

 located. 



THE WARREN SHORELINE 



The altitude usually given the Warren stage is 660 to 670 feet. 

 According to the contours, some of the ridges which I have mapped 

 under the Warren stage rise a few feet above the 670-foot contour. 



The Black river depression did not make much of a bay in 

 Lake Warren. The irregularity of its shoreline is due to the irregu- 

 lar outline of the Berea outcrops. At two points this sandstone 

 had a cusp-like extension into the lake: at Avon Center and at 

 Sheffield Junction. West of the latter place the escarpment is cut 

 up into outliers. Between these tw^o capes the sandstone has been 

 removed for some distance southward, a fact that accounts for the 

 course taken by the drainage. 



On this sheet Lake ^^'arren had no islands. Only shale out- 

 crops beneath the Berea, the Bedford here not having the "Blue- 

 stone" phase which it contains farther east. Weathering proceeds 

 so easily and so regularly in mud rocks that the surface keeps uni- 

 form, except during the early part of an erosion cycle. 



JVest of Black river. — ^West of Beaver creek the Warren level 

 appears first in an inner, lower ridge. A short distance north of 

 this is a strongly developed beach steepened by wave erosion; an 

 outlier of sandstone nearby on the Vermillion sheet furnished an 

 abundant supply of beach-making materials. 



From North Amherst to the neighborhood of Sheffield Junc- 

 tion, the \^'arren beach consists of two and sometimes of three 



