1894] A Glacial Ice Dam. ; 489 
Along the east side of the North Fork, the hills rise rapidly 
to an elevation of about 250 to 300 feet, as they also do along 
the east side of the South Fork. Standing on these hills and 
looking west the country appears to gradually rise, but no very 
high hills are visible in this direction. A level, however, re- 
veals the fact that the land to the west is nearly as high, but 
is so filled in with drift that only the tops of the hills appear 
above the general level. 
In a few words, then, the conditions are these: waters flow- 
ing from the north, west and south, meet at near the center of 
the county and start due east, flowing a few miles over a broad 
flood plain, and then plunging directly into the hills of the 
eastern portion of the county and finally reach the Muskingum 
at Zanesville. 
As the Licking River leaves the open plain it enters the hill 
country in a narrow gorge with perpendicular walls 50 to 100 
feet high, and the hilltops, only a few hundred feet back on 
either side, rise 300 feet higher. This gorge is commonly 
known as the Licking Narrows, and is the subject of this 
sketch. 
For about 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 Balti- 
more and Ohio Railroad makes many rock cuts in order to get 
along on the south side, and there isscarcely room for the tow- 
path of the canal on the northside. The canal is in the river 
through this gorge. 
The left-hand margin of the map, plate XIV, represents the 
river at the center 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. The heavy shaded line 
represents the outcrop of the Waverly or Logan Conglomerate, 
` and wherever exposed presents an escarpment with an eleva- 
tion represented by the figures on the contour lines.’ 
he last curve of the gorge referred to above, extends to 
about O and P, at which point the curve of the next sigmoid 
! All vertical measurements are from the water level in the river, which is con- 
t on account of the dam below. 
