60 THE PREGLACIAL DRAINAGE OF OHIO. 



east of Burbank — where it was connected with the divide separat- 

 ing the Black from the Rocky river, and shows that a north 

 and south pre-glacial divide in the plateau did exist from Me- 

 dina to Wooster ; and where it was crossed by the continental 

 divide above Cedar valley, the Killbuck gorge was bisected. 



Here the hills banking the Killbuck are less than 80 rods 

 apart, although nearly 200 feet high, and the stream runs on 

 a rock bottom. 



From this point, and from all the northeast face of Con- 

 gress Tp. the collected waters were carried into one channel, 

 that of the Black River, at Lodi, and thence to the Lake. Drilled 

 wells west of Burbank show 100 feet to rock ; in the Harrisville 

 swamps 90 feet, and its bottom is studded with innumerable 

 boulders. Southwest of Lodi rock is found at 120 feet, and 

 two miles northwest of Lodi on the Little Black River, the 

 drill passed through 285 feet of drift before reaching rock, and 

 the well head is 45 feet below Lodi ; two miles north of this, 

 where the valley is 20 feet lower, no rock was struck at 270 

 feet, and one mile northeast rock was not reached at 217 feet, but 

 i| miles east of the line of these wells, with well heads 45 feet 

 above Lodi, rock was reached at from 200 to 204 feet and the 

 ascent is very rapid from here to the crest of the divide between 

 Black and Rocky Rivers, which follows the line between 

 Chatham and Lafayette townships. Many other wells have 

 been drilled in this region of which I have the records, but 

 these are enough to show that the preglacial trough over which 

 the Black River now winds its torturous course was many feet 

 lower than the present level of Lake Erie. The next observa- 

 tion of interest made here is connected with the unique Killbuck, 

 which now drains the northeast angle formed by the crossing 

 of the divides near Cedar Valley. 



Bisecting this angle was found a preglacial channel passing 

 northeast through the Jackson swamp to join the axial channel 

 near Creston. The three heads of the present Killbuck, after 

 uniting, follow in part this old channel across Canaan Tp. to 

 its northeast corner and there, turning abruptly west, the stream 

 cuts its way for seven miles through the divide to the trough 

 of Black River, where it again turns at an acute angle and pro- 



