Stereogram, how made, 11, 49 of Mount Ellsworth, 23, 95 of the Henry Mountains, 49 and Waterpocket flexure, 11 Steward laccolite, 32 , Mr. John F., cited, 66 Strains shown by dikes and sheets, 96 Stretching of strata, 80 Structure, Law of, 115 Suncracks, Fossil, 9 Superimposed drainage, 144 Systems of drainage, 124, 143 Table of altitudes, 117 densities of sedimentary rocks, 78 in order of superposition, 79 trachytes, 77 diameters of laccolites, 92 distances, 17 mean densities of certain rock series, 80 Tantalus Creek, 17 , Flood-plains of, 131 Taylor, Mount, 71 Temple Creek, 16 , Flood-plains of, 131 Terraces, River, produced by planation, 132 Tertiary strata protected by lava, 12 Thicknesses of individual strata, 7 Thompson, Prof. A. H., 1, 66 Thousand Lake Mountain, View from, 15 Timber land, 152 Trachyte, Porphyritic, 60, 64 Trachytes of the Henry Mountains not vesicular, 51, 64 Transportation, 100, 101 by streams, analyzed, 106 Conditions which determine rate of, 110 favored by comminution of material, 106 declivity, 108 quantity of water, 109 , Relation of, to corrasion, 111 Trend, Absence of, 2, 30, 98 Tu-nunk’ Sandstone, 4 Shale, 4 Unconformities, 8, 85 Unconformity at Salina, 14 Vegetation, General influence of, on erosion, 104 Veins, Absence of fissure, 83, 151 , Fissure, limited in depth, 82 Vermilion Cliff Group, 6 Vertical cleavage by sapping, 55 Volcanoes of the Plateau Province, Extinct, 67, 70 Volume of streams, Influence of, on erosion, 104 transportation, 109 , Relation of, to declivity, 113 Warren, General G. K., on the valley of the Minnesota River, 126 Waterpocket Cañon, 137 flexure, described, 12 , Passes across the, 16 Watersheds (see Divides). Weathering, 100 White, Dr. C. A.; identification of Henry’s Fork Group, 4 Whitney, Prof J. D., on inclination of bedding, 52 Winipeg, Origin of Lake, 126 Zones of laccolites, 57, 58, 74 [Illustration: Plate I. MAP of the HENRY MOUNTAINS AND VICINITY. Photographed from a model in relief. Triangulation by A. H. Thompson. Topography by W. H. Graves.] [Illustration: Plate II. STEREOGRAM of the HENRY MOUNTAINS AND WATERPOCKET FOLD. Including the same area as Plate I.] [Illustration: Plate III. MAP of the HENRY MOUNTAINS. by G. K. Gilbert. Photographed from a model in relief.] [Illustration: Plate IV. STEREOGRAM of the DISPLACEMENTS of the HENRY MOUNTAINS including the same area as Plate III. The Blue Gate Sandstone is restored so as to exhibit the form it received by the uplift of the laccolitic domes.] [Illustration: Plate V. MAP of the HENRY MOUNTAINS by G.K. Gilbert. From a model in relief.] ------------------------------------------------------------------------ TRANSCRIBER’S NOTES Page Changed from Changed to