Art. V] Carney, Glacial Dam at Hanover. 141 



"Newark River.'" The proximity of the two spurs, one from 

 either side of the valley, just east of the Hanover Brick Plant 

 (Fig. 3), and the fact that westward toward Newark and east- 

 ward toward Dresden the valley grows uniformly wider, sug- 

 gests that at some anterior "preglacial" time two streams here 

 headed against each other, the west-flowing one of the pair captur- 

 ing the other. 



This old drainage line controls from the north two tributary 

 valleys, one of which now carries the Rocky Fork, the other being 

 filled for some distance northward by the same drift material that 

 bars the major valley. This latter valley is more mature in general 

 aspect ; it now bears a stream to the northeast, probably in re- 

 versed course. The Rocky Fork has a drainage basin extending 

 about I'T miles to the north ; during the recession of the ice sheet 

 it carried an abnormal amount of water, the work of which is now 

 seen in the terraces of water-laid drift that skirt its course. 



From Toboso eastward is a valley whose maturity is strik- 

 ingly in contrast with the stream it now bears. The aggraded 

 glacial outwash materials that level up the floor of this valley, 

 which widens to the east, have been terraced by the swinging 

 meanders of a stream whose volume is likewise out of harmony 

 with the Licking River which joins the Muskingum at Zanes- 

 ville. 



West from Toboso for two miles the Licking traverses a rock- 

 walled gorge which abruptly expands south of Hanover into a 

 wide valley that heads about two miles farther south. This val- 

 ley is an arm of the old drainage line already described, passing 

 Hanover westward through Newark. 



Connecting these two east-west lines of dissection are four 

 gaps in the rock divide. Three of these gaps cut through or into 

 the Black Hand formation. The village of Hanover lies in the 

 most western ; the other three are designated on the topographic 

 map (Fig. 3) by the letters, A, B and C. 



The Hanover gap is Y-shaped, one branch extending toward 

 the Brick Plant, the other being traversed by the Rocky Fork. 



^ W. G. Tight, Professional Paper No. 13, V. S. Geological Survey (1903), 

 p. 18. 



