Art. V] Carney, Glacial Dam at Ifaiwver. 149 



altitude of the outwash materials now observed in valley C; the 

 well does not jyet into rock/ Levcrctt sus^i^i^ests that the surface 

 of the Hanover Dam ma\' stand ^no feet above the rock lloor of 

 the old valley.' The width of ^ap C" is measura]»le: its depth is 

 obviously below the surface of the drift under discussion. That 

 the rock-sculpturing' here observed antedated the formation of 

 the Hanover Dam seems very probable. 



If the disintegrated rock removed from these gaps. A. 15, C, 

 were replaced, and a wall of ice were standing across the east- 

 west valley at Hanover, we would then have, so far as this imme- 

 diate area is concerned, the recpiisite conditions for an ice-front 

 lake. But since such a lake would extend eastward, its level in 

 no case, save that of a hypothetical differential tilting, could rise 

 higher than the overflow that would be established at the first otit- 

 let reached ; such an outlet exists about one mile east of the area 

 shown on Fig. .'! ; it joins the valley of the Licking at Nashport. 

 and is traversed by the old canal. It appears therefore that any 

 one of the valleys. A, B, C, was fatal to the existence of the con- 

 jectured lake. P.ut if these gaps were not developed till after the 

 Illinoian ice-invasion, and if the other southward-extending drain- 

 age lines to the immediate east did not exist, then a body of water 

 was held up in this old valley by the ice. 



INTERPRETATION FROM THE STANDPOINT OF A VALLEY DEPENDENCY. 



Many difficulties of this problem clear up when we understand 

 that the ice reached into Muskingum 'bounty. Judging from the 

 amount of drift here deposited, from its stony texture, and from 



^ In a letter dated Nov. 27, 1903, Mr. G. E. Swigert says concerning this 

 well : It is a drilled well. It is 216 feet 3 inches from top of casing. We went 

 through 10 feet of yellow clay ; 90 feet of blue clay, or better known among 

 drillers as hard pan: and from there 114 feet of quick sand; thence to gravel 

 and completed the well in the finest (best?) coarse gravel I ever saw. There is 

 131 feet of water in the well. We struck a small seep of water about 85 feet 

 down. * * * \^'e took out a few leaves and one or two walnuts from the 

 quick sand about 150 feet down. * * * j never saw such mean stuff to work 

 with ; we would work all day, and get 2 or 3 feet. 



Tight, BuU. Sci. Lah. Deiiison Univ., Vol. VIII (1904). p. 44 and Plate 

 IV in his map and in his description places a 218 foot well just north of the 

 rock spur near the Brick Plant ; again lie speaks of it as "about one mile east of 

 Hanover." There is no other deep well in this part of the county, so Tight must 

 have been alluding to the Swigert well. 



Leverett (Loc. cit., p. 15(1) in discussing the old drainage quotes Tighfs 

 data concerning this well. 

 = Loc. cit., p. 286. 



