250 
ence of elevation between Bardwell Mill where the upper Trenton is shown, 
and the mouth of Little Black creek where the Precambrian outcrops, no 
such great thicknesses can be present. The Trenton at Bardwell Mill is 
probably not more than 150 feet. 
To the south of Trenton Falls there is an increase in the thickness of about 
20 feet per mile southwestward. Between the Globe Woolen Mills and 
Trenton Falls there is a difference in thickness of 210 feet in the distance of 14 
miles. In the well at Rome the Trenton is 375 feet, and 20 miles to the north- 
east it is from 200 to 250 feet. The general fact drawn from these indicates a 
sloping floor on which the Trenton was deposited, of 6 to 20 feet per mile to 
the southwestward; the slope bemg less in the northwestern part. 
The narrow gorge cut by the West Canada river extends for two and one- 
half miles up the river from Trenton Falls to the village of Prospect. Its 
walls are nearly vertical, varying in height from 100 to 200 feet. Through- 
out the entire course there are six waterfalls: the Sherman fall, near the 
southern end of the gorge, is about 30 feet high and a short distance above the 
power house; High falls is one-fourth mile south of the railroad bridge; it 
consists of an upper and a lower part with a total of 128 feet; the fall at the 
dam, just north of the railroad bridge, is about 40 feet high; and the Prospect 
falls at the upper end of the gorge is 25 or 30 feet high. The total fall of the 
stream within the two- and one-half miles is about 360 feet, according to the 
topographic map. In spite of the steep slope of the stream bed the south- 
ward dip of the strata permits an exposure of only 270 feet of the formation. 
Two systems of joints predominate in the Trenton, which are distinctly 
indicated by the appearance of the walls of the gorge. Nearly everywhere 
the joints are vertical, at least at a very high angle, and extend in an east- 
west and a north-south direction. The east-west system can be seen extend- 
ing across the gorge, especially at the falls, which are caused by the existing 
jomts. When large blocks of stone are removed by the current during high 
water, a new perpendicular surface is exposed over which the water falls. 
Thus the falls recede. This is especially seen in the case of Sherman Falls. 
During high water, the water falls over one joint plane on the east and another 
on the west, while during low water the entire stream falls over the rear joint 
on the west. The block of limestone between them will eventually be 
removed. 
The vertical walls of the gorge are maintained by the breaking off of large 
blocks of limestone along the north-south joints. 
