Art. V] Carney, Glacial Dam at Ifa/io7'er. 153 



features, and contains so inncli till, that its two level areas, which 

 indeed simulate true deltas, must he re.yarded as the result of an 

 tuiusual slack-water condition of immediately ice-front drainas^e. 



SL'.M.MAKV. 



1. 'Idle ice-front in eastern Licking COunty was characterized 

 h\' valle\' dependencies. i'urther work will douhtless show a 

 fringe of valle\- (le])endencies wherever the lohes of the ice sheets 

 reached into the rough toi)ography, resulting from the weather- 

 ing of the Mississippian and Pcnnsylvanian formations. 



2. The Hanover Dam is the i)roduct of one such valley de- 

 pendency. 



3. ddie amount of disintegration accomplished hy all weather- 

 ing agents since the invasion of the lllinoian ice sheet may easily 

 be overestimated. 



4. The principles of sedimentation illustrated hy the above 

 formations furnish suggestions in deciphering the erosion historv 

 of this part of Ohio. 



Geological Dcpartinciif, Dciiisoii Uiiiz'crsity, Granville, Ohio, 

 March, 1907. 



