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Show COMPLETION OP THE SURVEY- TRIANGULATION. ' 211 The island where we descended is a ridge composed of a stratum of white siliceous sandstone, two hundred feet thick, underlying one of black and gray limestone, which latter constituted its summit, and was filled with fossils of Cystiphyllnm, Syringipora, Favorite^ Fenestellay Streptilasma, and crinoidai joints, lima in crystalline limestone, and cyathophyUcB. In our return from the top of « the mountain, we followed the narrow, dry bed of a ravine or cafion that had been formed by the rush of a torrent of melting snows in the spring of the year. It was amazing to see what huge masses of rock had been moved by this agency- many of several tons weight having been carried far into the plain below. As we descended, the gorge, which had at first been almost shut up between perpendicular cliffs of white sandstone, opened out into a superb, wide, and gently sloping valley, sheltered on each side by beetling cliffs to the very water's edge, effectually protected fr6m all winds, except on the east, and covered with a most luxuriant growth of rich and nutritious bunch- grass. Near the shore of the lake, abundant springs of pure, soft water gush forth, amply sufficient for the consumption of all the stock the valley could supply with food. As a range for cattle, it wag all that could be desired; and i s superior to either Tuilla Valley or Antelope Island, on account of the complete protection it affords from the storms of winter, here both long and severe. To- day has been one of severe suffering, from the insufficient supply of water we were able to carry with us, every drop of which was consumed lone before we commenced our descent from the mountain. , ThursdayT June 27.- The survej) of the lake was finished yes- . terday, having occupied the incessant labour of nearly three months. Nothing now remained but to complete the observations upon the different triangulation stations that had been erected in the course of the examination. Thto camp was broken up, and we returned to our dep6t on Antelope Island; discharged such of the hands as were no longer required; procured a fresh supply of provisions from the city, and, on Wednesday, July 3d, started on our . tour around the lake, leaving three men upon the island, to take charge of the herd and to prepare the pack- saddlesi required for our return to the States. The triangulation of this part of the survey occupied us until the 16th, during which time the lake was again traversed in every direction, and observations were taken from the various stations |