532 The Ohio Naturalist. [Vol. XII, No. 7, 



SUMMARY: 



There seems to be sufficient evidence on which to base the 

 conclusion that no large lake occupied the plain to the west and 

 southwest of Newark after the recession of the late Wisconsin 

 time. 



The heavy bed of gravel between the late Wisconsin and 

 Illinoian clays cannot have been deposited in a lake. 



During the recession of the Wisconsin ice sheet a loop moraine 

 was fonned across the ancient valley of Jonathan creek just east 

 of Thornville station. 



The water impended between the ice and moraine converted 

 the lower portion of the valley into a lake. 



The waters broke through the moraine forming a well defined 

 overflow channel, not deep enough however to completely drain 

 the valley. 



This ancient basin is now occupied by Buckeye Lake. 



The evidence obtained from gas well records corroborates the 

 statements made by Read, Tight and Leverett of the existence 

 and establishes the location and extent of Newark valley a pre- 

 Illinoian valley from Newark, southwest to the Franklin county 

 line. 



This work was done under the direction of Dr. George D. 

 Hubbard, now of Oberlin College, to whom I am much indebted 

 for the assistance given in the field work and thru suggestions 

 concerning and criticisms on this paper. I also take this oppor- 

 tunity to acknowledge my obligation to Miss Clara G. Mark for 

 the excellent photograph and to Messrs. Bootin and Sawyer of the 

 Canal Commission for information of Buckeye Lake. 



Date of Publication, May 21, 1912. 



