The Abandoned Shorelines of the Oberlin Qnadrangh\ Ohio ii, 



Fig. 5 



Cuspate foreland of the Warren stage 



eventually tied to the shore. The ridges, south as well as north 

 of Avon Center, are of the cuspate type, showing how this foreland 

 was progressively extended by the deposition-work of interfering 

 currents. The shoreline l)eLween the foreland and the eastern mar- 

 gin of the sheet consists continuously of two distinct ridges, and for 

 part of the distance of three ridges. 



Before the close of the Warren stage, as shown by nearly the 

 entire reach of the shoreline, the waves and along-shore currents 

 had accomplished their maximum of structural work; then cliff- 

 cutting prevailed. Even where the beaches are best developed the 

 off-shore slope is much steepened. For several miles east of the river 

 a strip of muck or lagoon soil borders the beach cliff; north of the 

 muck is sandy clay, both apparently at the same level. Initially the 

 clay was a low barrier, but high enough to make a marsh. Ac- 

 cordingly it appears that Lake Warren had an intermediate slight 



