Summary 49 Sun River 38 Superior Upland 5, 10 Sweetgrass Hills 33 Sylvan Lake 20 T Tapirs 16 Tertiary Period 42, 43, 45, 46, 48 Teton River 33 Texas 7 Theodore Roosevelt National Memorial Park 35, 40 Till 34 _Titanotheres_ 16 Tongue River 39 Trails 2 Trees 1, 2, 7 Triassic Period 21 Triceratops 16 Trinidad, Colo. 25 U Uplift 11, 16, 19, 32, 37 V Valley development 39 Vaughn, N. Mex. 45 Vegetation 1, 2, 7, 10, 16 Vermejo Formation 16 Volcanoes 16, 20, 40 W Walsenburg, Colo. 24 Warping 11 Well-drilling 11 West Nueces River 46 White River 29, 39, 40 White River Group 16, 40, 44 Williston basin 11, 16, 33 Wind Cave 21 Wind deposition 44 Wyoming 20, 39 Y Yellowstone River 33, 38 [Illustration: U. S. DEPARTMENT OF THE INTERIOR • March 3, 1849] Transcriber’s Notes