“From the point where Cougar creek first drops beneath Gopher bridge, the old surface channel may be traced, though dammed and nearly obliterated in places. If the natural dam shown at the first point of entrance were removed, the stream would again revert to the old entrance. Southwest of the old entrance is a still older natural dam, whose removal would allow the stream to proceed to the Mill bridge; thence, following the ravine between the two camp grounds, it would pass directly across the Gorge, supposing that great rift not yet to exist, and flowing past ‘Entrance No. 3,’ would descend in a cataract beyond Lookout point. “There is no doubt that these particular beds of limestone are badly shattered in the mass. It is shown by the fact that the surrounding streams, the Gopher falls, the periodical stream flowing to Entrance No. 3, and that of the Goat falls all join the main stream by underground ways. There are several other instances where the present bed of the creek could hardly be due to shrinkage and erosion, as in the case of the deep rift of the Gorge lying directly across the dip of the strata (the strata dip a little south of east, at an angle between 35 degrees and 40 degrees). The same thing is noticed in the subterranean bed of the creek from the east end of the Witches Ball-room to where it crosses the main corridor near the Art Gallery. “From October 16 to 21, last, during the survey made of the Gorge series by the writer, though it was well below zero at the camp in the woods, there was no frost found in the cave interiors at a short distance from the entrance. Thus, two of the highest factors of disintegration, sun and frost, are lacking, when accounting for the wholesale cleavage that has taken place within the old waterways. The enormous size of the blocks, moreover, and the indication that the largest of them had been displaced a very long time ago would point to the agency of a severe shock or series of shocks such as would be caused by an earthquake or some similar seismic disturbance. That such disturbances have taken place and acted in this particular locality is borne out by other curious phenomena for which it is difficult to find a different explanation.