INDEX.
- Abajo Mountains, 67, 69, 152
- Agricultural lands, 152
- Alluvial cones and alluviation, 133, 139
- Alpine sculpture, 36, 38
- Altitudes of peaks and passes, 3, 117
- Analogues of the laccolite, 98
- Ancient rivers no larger than modern, 133
- Antecedent drainage, 143
- Arch, Bowl Creek, 45
- Arches, Forces which produced laccolitic, 87
- Aridity favorable to geological examination, 2, 98
- of the Colorado Basin in former times, 120
- Aubrey Sandstone, 8
- Bad-lands, Sculpture of, 120, 140
- Bischof, on contraction of igneous rocks in cooling, 76
- Blue Gate flexure, 13
- Bonneville, Outlet of Lake, 134
- Bowl Creek arch, 45
- Cañons of the Colorado as obstructions to travel, 1, 151
- as evidence of arid climate, 120
- Carboniferous strata, 8
- Carriso Mountains, 69, 152
- Circle Cliffs, 14
- Cleavage, Slaty, not found, 66
- , Vertical, produced by sapping, 55
- Cliffs, Circle, 14
- Climate, Arid, favorable to geological examination, 2, 98
- Coal, 5, 151
- Colorado Basin, History of the, 84
- Colors of sandstones, Local variation of, 7
- Comminution of detritus aids transportation, 106
- Competence, 110
- Conditions of rock flexure, 83
- Cones, Alluvial, 133
- Consequent drainage, 143
- Contact phenomena, 65
- Contraction of igneous rocks by cooling, 75, 80
- Corrasion, 100, 101
- Cover of the laccolites, Depth of the, 86, 94
- Crescent arch, 44
- Cotta, Prof. Bernhard von, cited, 75
- Cretaceous period, Disturbance at the close of the, 10, 85
- rock series, 4
- Cross-lamination, Inclination of, 7
- Dana arch, 43
- Declivity, General influence of, upon erosion, 102
- Declivities, Influence of unequal, on divides, 140
- Degradation (see Erosion), 99, 115
- Delesse on contraction of igneous rocks in cooling, 76
- Densities of igneous rocks, 75
- of sedimentary rocks, 77
- Density a condition of laccolitic intrusion, 73, 74
- of porphyritic trachyte, 77
- Denudation (see Erosion), 99, 115
- of laccolites, 21
- Deposition by running water, 111
- Diameters of laccolites, 92
- Dike near Mount Ellsworth, 59
- Dikes and sheets defined, 20
- Dinah Creek Pass, 3
- Dirty Devil River, Flood-plains of, 131
- Distances, Table of, 17
- Distribution of laccolites, Horizontal, 20, 30
- Divides in bad-lands, Rounding of, 122
- Drainage lines, Instability of, 125
- Dutton, Capt. C. E., on the intrusive rocks, 61
- Economic geology, 151
- Elk Mountains, 69
- Ellen Mount (see Mount Ellen).
- Ellsworth Mount (see Mount Ellsworth).
- Energy of muddy streams, 108
- streams, how measured, 106
- Equal action, Principle of, 123
- Erosion, Conditions which control, 102
- Erosion, Influence of rock texture upon, 103
- Farming lands, 152
- Faults on Mount Ellsworth, 23
- Fish Lake Valley, Structure of, 14
- Fissure veins limited in depth, 82
- Flaming Gorge Group, 6
- Flat-topped dikes, 28
- Flexure of rocks, Conditions of, 83
- Flood-plain defined, 127
- Flow of streams, Friction of, 107, 109
- Folds, The Great, 10, 11, 85
- Forces which produce laccolitic arches, 87
- Form of laccolites, 55
- Frost, 104
- Friction of flow of streams, 107, 109
- Geikie laccolite, 41
- Gold and silver, 151
- Granite, Eruptive, 70
- Graves, Mr. Walter H., 1
- Gray Cliff Group, 6
- Grazing lands, 152
- Heights, 3, 117
- Henry, Prof. Joseph, 1
- Henry Mountains, Altitudes of the, 2, 117
- caused by resistance of trachyte to erosion, 25, 35
- , Contributions of the, to the principles of erosion, 99
- , Detailed description of the, 22
- , Drainage of the, 144
- , Economic value of the, 152
- , Planation in the, 127, 149
- , Relation of vegetation to type of sculpture in the, 118
- , Route of travel to the, 14;
- Henry’s Fork Group, 4
- Hillers, Mount (see Mount Hillers).
- Hills of planation, 130
- Historical note, 66
- History of the Colorado Basin, 84
- Holmes, Mount (see Mount Holmes).
- Holmes, Mr. W. H., on the Elk Mountains, 70
- La Lata and Carriso Mountains, 69
- Hopkins on the power of currents, 106
- Howell laccolite, 34
- Hydrostatic equilibrium, Law of, 72
- Igneous mountains of the Plateau Province, 67
- Igneous rocks, Contraction of, by cooling, 75, 80
- Inconsequent drainage, 143
- Instability of divides, 139
- drainage lines, 125
- Interdependence of drainage slopes, 123, 141
- Internal structure of laccolites, 55
- Intrusive rocks of the Henry Mountains, 59, 61
- Isolation of the Henry Mountains, 2, 18
- Jerry Butte, 34
- Jukes Butte, 46
- Jukes, Prof. J. Beete, on prismatic structure, 76
- Jura-Trias rock series, 5
- Kaibab structure, 11
- Laccolite A, 32
- B, 32
- C, 32
- D, 35
- E, 41
- F, 42
- , Geikie, 41
- H, 46
- , Hillers, 30
- , History of the, 95
- , Howell, 34
- , Jukes, 46
- , Marvine, 42
- , Newberry, 41
- of Mount Ellsworth, 27
- of Mount Pennell, 36
- of the western base of Mount Ellen, 40
- , Peale, 47
- , Possible analogues of the, 98
- , Scrope, 47
- , Sentinel, 38
- , Shoulder, 42
- , Steward, 32
- , The, defined, 19
- Laccolites, Age of the, discussed, 84
- , Composite, 55
- , Denudation of, 21
- , Depth of cover of, 86, 94
- , Detailed description of, 22
- , Diameters of, 92
- , Form of, 55, 91
- , Holmes, 27
- , Horizontal, distribution of, 20
- intruded in soft beds, 58
- , Limital area of, 90, 97
- thickness of, 91
- , Material of, 59
- not prismatic, 55
- of the Elk Mountains, 70
- of other regions, 97;
- size limited, 86
- subsequent to the strata which inclose them, 51
- , Vertical distribution of, 21, 56, 65
- Laccolitic mountains of the Plateau Province, 67, 69
- Lake Bonneville, Outlet of, 134
- Land, Agricultural, 152
- La Lata Mountains, 68, 69, 152
- La Sal Mountains, 68, 69, 152
- Law of divides, 116
- , Exception to the, 122
- Lewis Creek plain, 128
- Limital area of laccolites, 90, 97
- thickness of laccolites, 91
- Load, Relation of, to comminution, 107
- Mallet, Robert, C. E., on contraction of igneous rocks in cooling, 76
- Marvine laccolite, 42
- Ma-suk’ Plateau, 13
- Maze arch, 44
- Metamorphism in the Henry Mountains, 65
- Minerals of the Henry Mountains, 61, 64
- Monoclinal shifting, 135, 140
- Mount Ellen, Character of sculpture of, 118
- Mount Holmes, Vegetation of, 118
- Mount Taylor, 71
- Mud-cracks, Fossil, 9
- Navajo Mountain, 69, 152
- Newberry, Dr. J. S., on the Sierra Abajo, 67
- Oblique lamination, Inclination of, 7
- Peale, Dr. A. C., on igneous mountains of Colorado, 69
- on the Elk Mountains, 70
- Peale laccolite, 47
- Pennell, Mount (see Mount Pennell).
- Pennellen Pass, 3
- Pine Alcove Creek, Former course of, 130
- Planation, 126, 139
- , Hills of, 130
- Plasticity of solids, 82, 83, 97
- Plateaus enumerated, 13
- Precipitation from running water, 111
- Pressure a condition for rock flexure, 81, 83, 96
- Prismatic structure, Absence of, 55, 76
- defined, 55
- Ponding, 125, 139
- Porphyritic trachyte, 60, 64
- Porphyry; use of term discussed, 63
- Powell, Prof. J. W., on the climate of the Colorado Basin, 120
- Pulpit arch, 33, 147
- Rankine on flexure of beams, 90
- Red Gate flexure, 13
- Revet-crags defined, 25
- Ripple-marks, Fossil, 16
- River terraces produced by planation, 132
- Rivers, Ancient, no greater than modern, 133
- Rock texture, Influence of, on sculpture, 115, 135, 140
- , General influence of, on erosion, 103
- Rocks of the Henry Mountains, Intrusive, 59, 61
- , Sedimentary, 3
- Rotation of the earth, 142
- Route to the Henry Mountains, 14
- San Rafael fold, 16, 18
- Scrope laccolite, 47
- Sculpture, Alpine, 36, 38
- Sculpture of bad-lands, 120
- Sentinel Butte, 38
- Sheets and dikes defined, 20
- Shin-ar’-ump Group, 6
- Shoulder laccolite, 42
- Sierra Abajo, 67, 69, 152
- Solidity of rocks not absolute, 82, 83, 97
- Specific gravities (see Densities).
- Specimens of Henry Mountain trachyte, 60
- Springs; relation to soft strata explained, 82
- Stability of divides, 138
- of drainage lines, 124
- Stereogram, how made, 11, 49
- 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
- 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
- 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
- Warren, General G. K., on the valley of the Minnesota River, 126
- Waterpocket Cañon, 137
- 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