250 



enee of elevation between BardweU Mill where the upper Trenton is shown, 

 ;hkI the mouth of Little Black creek where the Precambrian outcrops, no 

 such greal thicknesses can be present. The Trenton a1 BardweU Mill is 

 probably not more than 150 feet. 



To the south of Trenton Falls there is an increase in the thickness of aboul 

 20 feet per mile southwest ward. Between the Globe Woolen Mills and 

 Trenton Falls there is a difference in thickness of 210 feet in the distance of ] 1 

 miles. In (he well at Rome the Trenton is 375 feet, and 20 miles to 1 he 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 being 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. Jts 

 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 I lie 

 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 I he 

 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 he seen extend- 

 ing across the gorge, especially at the falls, which are caused by the existing 

 joints. 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 he 

 removed. 



The vertical walls of the gorge are maintained by the breaking off of large 

 blocks of limestone along the north-south joints. 



