This chasm is about six miles from Independence Rock, and there were believed to be many herds of stolen stock concealed back in the valleys beyond what would seem to be an eastern spur of the Sweetwater range of mountains. Ben, Fred, Paul and I undertook an exploration of the summit of the mountain and also of the gorge, which we entered at the point from which the stream emerges from the chasm. We followed up the right bank of the river, clambering over the rocky shore, all of which proved rather an easy task. From a slight elevation we were able to look through the entire extent of the chasm, which appeared to be about twelve hundred feet in length, and varied from four to ten rods in width. In the narrowest pass it is compressed within walls hardly more than two rods apart. The sides of the cliffs rise to a height of about four hundred feet. Why and how the river forced its way through this isolated, granite cone, seems a mystery, as there is apparently no obstacle to prevent its flowing undisturbed round the lower borders of the south slope. Some great convulsion of nature must have split the mountain through its center and opened this channel. The chasm was certainly not formed by erosion, for the sides of the cliff expose a face of grey, weather-stained granite, with perpendicular seams and scoriated trap rock. Reaching the narrowest point in the gorge we found it impossible to proceed further, as the swift, foaming waters of the rapids swept along the base of the high walls, rushing over and between the broken masses of rock that had tumbled down, leaving no footing near the banks of the stream.