OF DENISON UNIVERSITY. 39 



the rocky island indicated on the plate southwest of Hanover, 

 thus causing the present valley to narrow rapidly. The canal 

 follows along the margin of this higher ground where it reaches 

 to the flood plain of the river. A few miles below Claylick the 

 canal enters the river for the valley has now become so narrow 

 that there is not room for the two. The river here leaves its 

 open valley and enters the hill country in a narrow gorge with per- 

 pendicular walls 50 to TOO feet high and the hill tops only a few 

 hundred feet back, on either side rising 300 feet higher. This 

 gorge is commonly known as the Licking Narrows. 



In the first mile of this narrow cut there are two or three 

 large curves but the gorge is on an average about 500 feet 

 wide and confines the river in narrow limits. The Baltimore 

 and Ohio Railroad makes many rock cuts in order to get along 

 on the south side and there is scarcely room for the tow path 

 of the canal on the north side. 



The left hand margin of the map, plate I, represents the 

 river at the centre of the last curve of this mile of gorge. The 

 walls at X are 45 feet high and overhanging, showing a large 

 amount of undercutting on the curve. On the opposite side of 

 the river the wall is 40 feet high and at XX there is a low shelf 

 about 10 feet high which projects a little beyond the vertical 

 wall on this side. The heavy shaded line represents the out- 

 crop of the Waverly or Logan conglomerate and wherever ex- 

 posed presents an escarpment with an elevation represented by 

 the figures on the contour lines. ^ 



The last curve of the gorge referred to above extends to 

 about O and P at which point the curve of the next sigmoid 

 begins. The gorge runs on past L m to the centre of the next 

 curve at OO, completing the curve at the point n. The river 

 however, does not follow this course as will be seen by fol- 



^All vertical measurements in the description of this gorge are from the 

 water level in the river which is constant on account of the dam below, and is 

 about 776 feet A. T. 



