134 Bulletin of Laboratories of Denison University [Vol. Xlll 



into the valley of the North h'ork of the Lieking River, and be- 

 longed to the ancient Newark River.' 



This tongue-like extension of the ice pushed eastward to the 

 point wdiere the valley turns to the north ; a tributary from the east 

 which joins the major at its bend to the north, being in line with 

 the feeding ice, was blocked also. The ice reached northward 

 but a short distance beyond this angle ; a few drift knolls mark this 

 brief position. A halt of considerable duration was made after the 

 ice had retreated to a position bringing the north side of the valley 

 tongue directly across the valley ; here it built a marginal ridge 

 averaging 90 to 95 feet high, at no point lower than 10 feet, and 

 about 500 feet broad at the base (Fig. 4). A terrace of similar 

 development marks the outline of the ice against the walls of the 

 valley elsewhere, except in front of the tributary valley, mentioned 

 above, through which most of the drainage from the ice was led 

 east to the Rocky Fork valley. It is evident that the Rocky Fork 

 drainage had gained control of the mature valley long previous to 

 its being occupied by this ice. 



These moraine terraces, best developed on the south side of the 

 valley, are very conspicuous. Commencing across the valley from 

 the hills mentioned by Wright,' a terrace of the aggradation ty])e 

 reaches half-way up the valley wall ; it gradually descends east- 

 ward, where it becomes more irregular both because of initial dis- 

 tribution and of subsequent weathering. The line of demarkation 

 between this drift and the upward slo]5e is sharp. 



The main body of ice, while the tongue reached eastward, 

 maintained a position nearly north-south for a few miles each way 

 from Wilkins Run. North of this place, so far as .Alary Ann 

 Township is concerned, the retreat of the ice-front appears to have 

 been rapid, and there is no evidence that the valley lobe maintained 

 intermediate positions ; but the old valley becoming broader south- 

 west of Wilkins Run encouraged a tongue-like extension of ice 

 at the next halt of the ice-field : the well-develojied valley train 

 already mentioned was formed at this time. 



At Hanover. — Flere we have a nuicli wider valle\- than the case 



' W. (J. Tif;li(. J'nifissioiiiil I'liixr \<>. J.I. V. S, (ieolo.uicnl Survey (lOO:!), 

 p. 18. 



■* fjoc. fit., p. 755. 



