INDEX

Abstract, 1 attenuata, Neorthroblattina, 45 Acknowledgments, 4 attenuata, Pinus, 67 AdiantUes rockymonlanus, 40 Atwood, 74, 76, 146 Adler, 110 auriculata, Neuropteris, 46 adolescens, Cercophyllis, SO Agate Creek, 13,15, 20, 64, 69, 70,118 Baculites compressusf, 55 Agglomerate, 58 Baculites ovatus, 55 Agriochoerus sp., 66 Badger Creek, 5,13, 72 albolineata, Neorthroblattina, 45 Divide, 9, 17, 72 Algae, lime-secreting, 46 Drainage, 70, 141 Algal limestone, 41, 46, 63, 67, 68 Erosion surface, 9, 73, 76, 141, 142, 147, 148 Allantodiopsis erosa (Lesquereux) Knowlton, 59 Badger Spring, 48 Alma, 35, 39, 77 Badger Springs ranch, 46 Ammonite, 53 Baker, 48 Analcite trachydolerite and syenite: Norm and Baker Lake, 83 mode, 42 Baker Lake porphyry, 81, 83 Anchurat sp., 56 Baker Lake quartz monzonite, 81 Anchuria sp.?, 55 Bald Knob, 84 Ancyloceras jenneyi, 55 Bald Mountain, 79 Andesite, 68, 81 Balfour, 53, 57,112,113 Composition, 105 Balfour formation, 61, 102, 106, 118, 140 Andesite and trachyte: Norms, 105 Age and general relations, 62 Andesite extrusive stage, 138 Description, 61 Aneimia sp. cf. elongata (Newberry) Knowlton, Distribution, 61 57 Section measured, 62 Antero basin faults, 129 Ball, 17,19, 21, 22, 81,110, 126 Antero formation, 61, 63, 65, 67, 73, 102, 106, barabini, Inoceramus, 55 110, 118, 140, 143, 149 Barite, 47 Age and general relationships, 67 Barnes, 19,133 Description, 63 Bartlett Mountain, 8 Fossils, 66 Basin Gap, 95, 115, 126 Section in Sec. 8, T. 14S., R. 75 W., 171 Basin No. 2 triangulation station, 11, 58, 124 Section in Sec. 14, T. 10 S., R. 75 W., 170 Basin Ridge, 11, 95, 98, 99, 100, 101, 115, 117, Thickness, 65 123, 125, 126 Antero Junction, 103, 118 Basin Ridge faults, 126 Antero reservoir, 11, 17, 44, 63, 106, 110, 129, Basin Ridge syncline, 100, 115, 117, 131 140 Basin Ridge volcanics, 58, 81, 95, 97, 115, 117, Antero syncline, 118,129,130 125 Anthracoblattina triassica Scudder, 45 , 81, 94,100,101,115 Aplite, 23 Red and white member, 99 Appendix, 150 Stratigraphy, 97 Araucarites sp., 46 Bastin, 19 arcuata, Poroblattina, 45 Bath, 43 Arcula gastroides, 53 Bath sandstone, 43, 46 Arkansas River, 3,17, 69, 72, 80,101,138 Beaver Creek, 15, 77 Arkansas River valley, 80,144,146 Beaver Ridge, 77 Arnold, C. A., 41 Behre, 80,92,93, 99,128,136,147 Artemisia sp., 67 Betterophon, 45 Artophycus columnarius Johnson, 41 Benson, 99 asplenoides, Sphenopteris, 40 Benton formation, 51, 52, 53, 118, 119, 125, 134 Asterophyllites longifolius, 40 Age and relations, 53

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Benton formation (Cont'd.) Chalmers quartz monzonite, 81, 84, 86, 90, 94, Fossils, 52 101 General description, 52 Chemical analysis, 86 Section, 164 Norm and mode, 85 Bentonite, 52, 55 Petrography, 85 berthoudi, Ficus, 59 Chalmers Ridge, 84 Beveled bedrock, 10 Chamberlin, R. T., 136 Bibliography, 174 Churales, 50 bijidus, Gomphostrobus, 46 Chase Creek basin faults, 129 Big Baldy Mountain, 82 cheathami, Sphenopteris, 40 Big Black Mountain, 5, 8, 94,101,102,103, 140, surface, 142, 147, 149 148 cheyennsis, Fasciolaria, 55 Boreas Mountain, 79 Chubb Gulch, 40, 43 Boreas Pass, 8, 80, 81, 82, 83 Chubb siltstone, 42, 43,44, 47 Bradley, 67 Section, 151 brongniarti, Scutinoblattina, 45 Church, Victor, 3 Brontotherid, 66 Cinulia (Oligoptycha) concinna Hall and Meek, Brown, G. F., 3 56 Brown, R. W., 51, 59, 67 Cipridae, 66 Buckskin Creek, 76 Cirque, 8, 79 Bufflalo Creek, 79 Cissrn hesperia Knowlton, 59 Bufflalo Peaks, 5, 6,35, 39, 40, 74, 78, 103, 105, Clarke Ranch, 95 119 Clements, 99 Bufflalo Peaks andesite, 44, 81, 103, 104, 106, Climate, 13 138 Coal, 37, 56 Age and source, 104 Coffman conglomerate, 35, 42 Petrography, 104 Cofiman Ridge, 9, 33, 70, 119 Bufflalo Springs Ranger Station, 43, 128, 132 Cole, 98 Burbank, 136 Colorado, 48 Butler, 35, 77, 128 Colorado and Southern Railroad, 10 Colorado group, 53, 54 Caenopus? sp., 66 coloradoensis, Cryptozoon, 41 Calamites kutorgae?, 46 coloradensis, Oncobyresella, 67 Catamites sp., 40, 41 coloradensis, Platanus, 59 Calcareous algae, 47 columnarius, Artophycus, 41 calcarius, Stylophucus, 41 Como, 10,11,12, 54, 55, 56, 58, 59, 82, 114,115, Callipteris cf. hymenophylloides, 46 124, 131, 146 Callipteris cf. lyratifolia, 46 Como erosion surfaces, 12, 72, 73, 74, 76, 141, Callista sp.?, 55 142, 143, 144, 147, 149 Calyptophycus verrucius Johnson, 41 Como Ridge, 82, 95 Cannon, 19 Como syncline, 114, 131 Canyon cycle, 6 Composita sp.?, 45 Capps, 73, 74, 75, 76, 78 compressus, Baculites, 55 carbonaria, Gouldina, 41 concinna, Cinulia (Oligoptycha), 56 carbonarius, Stylophucus, 41 Concretions, 54, 69 Cardium (Ethmocardium) whitei Dall, 56 Cone-in-cone, 55 Carlile sandstone, 52,53,119 congesta, Ostrea, 54 Castle Mountain, 102, 103 Continental Divide, 5, 8, 75 Celastrus (?) gaudini Lesquereux, 57 Control, horizontal, 4 Cercocarpus sp., 67 Control, vertical, 4 Cercophyllis adolescens Scudder, 45 Copper-vanadium minerals, 46 Cercophyttis delicatula Scudder, 45 Cordaianthus sp., 40 Cercophyllis justiciar Scudder, 45 Cordaicarpon sp., 40

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Cordaites sp., 40 Drainage changes, 141 Cornus impressa Knowlton, 59 Dredge, 78 Cover Mountain, 102 Dreikanter, 146 craterélla, Valvaia, 66 Dreyer, R. F., 3 Crawford, 83 Durango sfage, 74, 76 Creede, Colorado, 67 , 42 Einkanter, 146 Cretaceous, 51, 53, 56 El Portal drift and stage, 74, 76 Crinoid stems, 45 Eldridge, 42 Crooked Creek, 15 elegans, Scolecopteris, 46 Cross, 42, 48, 103, 104, 106, 110 Eleven Mile Canyon, 8, 76,142 Crustaceans, 41 Elkhorn thrust, 20, 112, 113, 118, 120, 121, 122, Cryptozo&n coloradoensis Johnson, 41 123,124, 125,130, 135,136,140 Cuestas, 144 Elkhorn Upland, 9, 10, 12, 15, 73, 144 Currant Creek, 101 elongata, Aneimia sp. cf., 57 Cyanophyceae, 67 Emmons, 33, 35, 42, 92, 93, 94, 104, 127, 128, 136 Dactylopkyttum johnsoni, 40 Empire Gulch, 6 Daly, 99 Entrada formation, 27, 48 Dakota hogback, 10, 11, 12, 47, 49, 51, 52, 53, Eocene, 57, 138 54, 63, 125, 126, 130, 142 Eocene sedimentation and orogeny, 137 Dakota sandstone, 50, 51, 112, 113, 118, 119, Eocene-Oligocene volcanism, 81 125 equilateralis, Tellina, 56 Age and general relations, 51 erosa, Allantodiopsis, 59 General characteristics, 54 Erosion surfaces, 10, 148 Section in T. 9 S., R. 77 W., 162 Eshe Hills, 11, 12 Section in Sec. 32, T. 10 S., R. 76 W., 163 Eshe porphyry, 81,82,83,114,131,136 Thickness, 51 Eshe quartz monzonite, 81 Dane, 48 Eshe ranch, 81, 82, 83 Davis, J. R., 3 Etoblaltim persistens Scudder, 45 Deadwood Creek, 79 Etoblattina sp. Scudder, 45 Deadwood Gulch, 79, 80 Evans Peak, 40 Deflation, 10, 17, 145 Exogyra sp.?, 53 Deformation, 57 Extrusive rocks, 95 deformis, Inoceramus, 54 delicatula, Cercophyllis, 45 Fairplay, 10, 11, 12, 39, 44, 45, 46, 68, 73, 76, Denlalium gracile, 55, 56 77, 92, 144, 146 dentata, Sphenopteris, 46 Fasciolaria cheyennsis, 55 formation, 57, 81, 84, 95, 100, 103, 106, Fasciolaria? sp., 56 112, 113, 114, 115, 116, 122, 124, 125, 131, Fault pattern, 131, 137 136 Faults, 31, 93, 94, 120, 125 Age and general relations, 59 Field work, 3 Description, 57 Finlay, 50 Fossils, 59 Fish, 53, 54, 55 . Section, 168, 169 Ficus berthoudi Lesquereux, 59 Thickness, 58 Ficus pseudopopulus Lesquereux, 59 denveriana, Joglans, 59 Flint, 136 Dielasma sp., 45 Florissant lake beds, 67 Diplotmema patentissima, 40 Flow , 58, 82, 95 Huhoschi, Neuropteris, 40 foeminaeformis, Pecopteris, 46 Dolores formation, 48 Folds, major, 113 Dosiniopsis sp., 56 Foraminifera, 54 Drainage, 5, 15 Fork Gulch, 12

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formosa, Mactra (Cymbophora), 56 Gram, O. E., 3 Forrest, Lesh, 3 Grand Canyon, 47 Fossils, 51, 54, 56, 57, 63, 68, 81 Granitization, 21 Fossil wood, 41, 62, 66 Gravel cover, 10 Fountain formation, 41 Gregory, 98 Fourmile Creek, 11, 73, 74, 78 Green Ridge surface, 147 Fouque, 99 Greenhorn limestone, 52, 53 Fox Hills formation, 54, 55, 56, 57, 81, 84, 86, Gryphaea newberryi, 53 87, 112, 114, 125 Gryphaea sp., 52 Section, 166 Guffey, 103, 106, 138 fragilis, Inoceramus sp? cf., 53 guUldmae, Platonus, 59 French Creek, 79 guttata, Spiloblattina, 45 French Pass, 8 gutzholdi, Sphenopteris, 46 , 3, 19, 21,48, 86, 110, 111 Gypsiferous soil, 44 Fuller, 110 Gypsum, 44, 45, 52 fusiformis, Pugnellis, cf., 53 Gyrodes sp., 53

gardineri, Spiloblattina, 45 Hall Buttes, 11,13,103,105 Garo, 10, 11,46,48, 51, 52, 53, 95,115, 132,142, Halymenites major, 56 145 Harris, D. V., 3 Garo sandstone, 10, 47, 134 Hartsel, 10, 11, 20, 45, 47, 49, 51, 53, 54, 55, Age and correlations, 48 57, 65, 76, 106,110, 112, 115, 124, 127, 131, General description, 47 132 Section in Sec. 13, T. 10 S., R. 77 W., 160 Hartsel fault, 130 Section in Sec. 36, T. 11 S., R. 76 W., 160 hastatus, Sibillariostrobus, 46 Thickness, 48 Heaton, 48, 133 Garry, 17, 19, 21, 23, 81, 110, 126 Heavy minerals: Grain counts, ratios, percent- Gas, 87 ages, diagnostic properties, and correla- gastroides, Arcula, 53 tions, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 Gastropod, 45, 52, 66, 68 In Trump and Wagon tongue, 71 Bellerophon type, 45 Hemiaster sp.?, 55 Gazin, 67, 69 Henderson, C. F., 3 gaudini, Cdastrus (?), 57 Henderson, Junius, 55 General summary, 149 hendersoni, Gonyodiscus, 66 Geologic history of South Park, 132 Hermit shale, 47 Georgia Pass, 8 Hermosa formation, 41 gigantea (cf.), Neuropteris, 40 hesperia, Cissus, 59 Gilluly, 90 heterophylla, Neuropteris, 40 Girsandla sp.?, 41 High Creek, 76 Glacial erosion, 75 Hill, 19 Glacial stages, 146 Hoagland, A. D., 3 Glentivar, 49, 52, 125 Hogback, 11 Glentivar dome, 118 Hoosier Pass, 8, 77 Goddard, 136 Horseshoe Creek, 92 Gold, 77, 80 Horseshoe Gulch, 11, 128 Gomphostrobus bifidus Potonie, 46 Hoskin, 128 Gonyodiscus hendersoni, 66 Howard, 148 Gould, 35, 39,42,94, 127 gouldi, Shermanophycus, 41 Howbert, 21,106,110,112 Gouldina carbonaria Johnson, 41 Huerfano Basin, 53 Gouldina magna Johnson, 41 hymenophylloides (cf.), Callipteris, 46 gracile, Dentalium, 55, 56 Hypisodus sp., 66 gracilis, Leptophycus, 41 hypnoides, Walchia, 46 gracilis, Walchia, 46, 47 Hyracodon sp., 66

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Idaho Springs formation, 16, 17, 19, 110, 132 Lamb Mountain, 92, 94 Distribution and general character, 17 Lamprophyric rocks, 86, 94 Origin, 19 LaPlata, 48 Illinoian (?) drift, 73, 74, 144 Laramide revolution, 85, 90, 95, 135 Illinoian (?) glacial stage, 12, 74, 80 Laramie formation, 56, 59,131 Illinoian (?) moraines, 74, 75, 77, 78, 79, 80 Age and general relations, 57 Illinoian (?) terraces and outwash, 73, 74, 76, Description, 56 78, 79,80,143,144 Section at King, 167 impressa, Cornus, 59 Section at Peabody Switch, 167 Indiana Creek, 80 Thickness, 57 Inoceramus, 54 Later drainage changes, 142 barahini, 55 Later events of probable Miocene and Pliocene deformis, 54 times, 141 sp? cf. fragilis, 53 Later Tertiary events, 138 labiatus, 52, 53 latiloba, Woodwardia, 59 vanuxemi, 55 Lava-capped Hall Buttes, 11 Insectivore, 66 Lavas 113 intermedia, Scutinoblaltina, 45 Leadville district, 35, 42, 127 Intrusions, 81,93 lebachensis, Sphenopteris, 46 Iowa Gulch, 6 Lee, 48, 133,136 Lepidodendron, 41 Irving, 35, 93, 94, 127, 128, 136 Lepidostrobus weberensis, 40 Leptictid, 66 Jahns, R. H., 3 Leptomeryx sp., 66 Jefferson, 11, 12, 52, 54, 56, 57, 123 Leptophycus gracilis Johnson, 41 Jefferson Creek, 11, 74, 75, 79 Lit-par-lit, 13, 17, 21, 22, 111 Jefferson Creek valley, 73 Little Baldy Mountain, 10, 51, 124, 125, 128, Jefferson Gulch, 74 131 Jefferson Hill, 11 Little Black Mountain, 11, 35, 39, 43, 92, 94 Jelm, 48 Pétrographie description, 93 jenneyi, Ancyloceras, 55 Quartz monzonite porphyry, 81 Johnson, 33, 35, 38, 41, 46, 50, 53, 67, 133 Structural relations, 93 johnsoni, Dactylophyllum, 40 Little Sacramento gulch, 76 Juglans denveriana Knowlton, 59 London, 136 Jurassic sediments, 47, 49 London fault, 94, 120, 124, 125, 128 justiciae, Cercophyllis, 45 London mine, 37 Kaolin, 47 longifolius, Asterophyllites, 40 , 8, 21, 49, 51, 94, 122, 142, 147, Lonsdale, 90, 92 149 Loughlin, 35, 93, 94, 127, 128, 136 King, 58, 59, 113 Loveland Mountain, 6 King Mines, 55, 56, 57 Lovering, 21, 110, 121, 126, 133, 134, 136, 142, Klippen, 20, 121, 122,123 147, 149 Knowlton, 59 Lucina sp.?, 55 kutorgae (?), Catamites, 46 lugubris, Ostrea, 53 Lykins, 48 labiatus, Inoceramus, 52, 53 Lymnaea, 68 Lake Antero, 63, 67 Lymnaea (Pseudosuccinea) nébrascensis, 66 Lake beds, 61, 62, 63, 65, 102, 106, 113, 118, lyratifolia (cf.), Callipteris, 46 129, 140, 171 Lake bed deposition, 138 Mactra (Cymbophora) formosa Meek and Lake Cheesman, 15 Hayden, 56 Lake Como, 55 Magdalena formation, 41 lakesii, Neorthroblattina, 45 magna, Goiddina, 41 lakesii, Poroblattina, 45 major, Ealymenites, 56

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Mansfield, 136 Mosquito Gulch, 76 marginata, Spiloblattina, 45 , 5, 6, 8, 9, 11, 22, 37, 74, 75, Maroon formation, 42, 44, 46, 47, 78, 82, 106, 76, 77, 81, 93, 111, 112, 134, 135, 148 125, 128, 129 Mosquito-Sawatch uplift, 136 Age and general relations, 46 Mosquito-Weston fault, 94, 119, 120, 125, 127, Description, 43, 44 136 Fossils, 45 , 76 Section at Buffalo Springs Ranger Station, Mount Cameron, 76 156 , 79 Section at , 157 Mount Hall, 106 Section at Woods Homestead, Long Gulch, , 76 154 Mount Silverheels, 5, 8, 45, 77, 80, 82, 124, 125 Section between Fairplay and Red Hill, 155 Muilenburg 81, 82, 83 Section in Sec. 7, T. 12 S., R. 75 W., 153 Muleshoe porphyry, 85 Section in Sec. 25, T. 12 S., R. 76 W., 153 Muleshoe quartz monzonite porphyry, 81 Subdivisions and general character, 43 Myrmekite, 20 Maroon-Weber (?) boundary, 41 Marsupial, 66 nebrascensis, Lymnaea, 66 Marvine, 19 nebrascensis, Populus, 59 Mather, 74, 76 nebrascana, Pterin, 56 Matthes, 74, 76 Neorthroblattina albolineata Scudder, 45 Matthews, 20 Neorthroblattina attenuata Scudder, 45 Mclntire Mountain, 103 Neorthroblattina lakesii Scudder, 45 McQuaid's Ranch, 35, 41, 44, 103 Neorthroblattina rotundata Scudder, 45 meieri, Petrablattina, 45 Neuropteris auriculata Germer, 46 Melton, 133 Neuropteris dluhoschi, 40 Mesohippus sp., 66 Neuropteris cf. gigantea, 40 Mesozoic history, 134 Neuropteris heterophylla, 40 Mexican Ridge, 113, 117 New South Wales, 99 Mexican Ridge anticline, 116 newberryi, Gryphaea, 53 Michel-Levy, 99 newberryi, Pyrifusus, 56 Michigan, 113 Newett limestone, 39 Michigan Creek, 15, 73, 74, 75, 76, 79, 144 Niobrara formation, 53, 118, 119, 166 Michigan syncline, 113, 116, 120, 121 Age and general relations, 54 microcarpa (cf.), Sphenopteris, 40 General description, 53 Migmatization, 19, 20 Thickness, 54 Miller, H. W., 3 nodosus, Scaphites, 55 Mixing by replacement, 20 Normal faults, 129 Miocene, 140 North Fork, 15 Miocene and Pliocene, 68 Nucula? cf. planimarginata Meek and Hayden, Monocotyledonous (?) grass, 57 56 Montana division, 56 montana, Sabal, 57 obovatum, Sphenophyllum, 46 Montgomery Gulch, 79, 80 Odontopteris subcrenuiata Bost, 46 Moraines, 11, 77 Oil, 54, 86, 87 Morrison formation, 48, 49, 51, 115, 134 Oil well dike, 86, 94 Age and correlation, 50 Petrogenesis, 89 Description, 49 Petrography, 87 Fossils, 50 Oil well intrusion: Chemical analyses, 91 : General relations, 50 Modes of various facies, 88 Section in Sec. 12, T. 9 S., R. 77 W., 161 Oligocene (?), 61, 63, 140 Section near Hartsel, 162 Oncobyrsetla coloradensis, 67 Thickness, 50 Osborn, 106 Mosquito fault, 127 osborni, Trigonia, 66

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Ostracod, 41, 64, 66 piniformis, Walchia, 46 Ostrea, 56 pinnatifida, Fecopteris, 46 Ostrea congesta, 54 pinneformis, Walchia, 46 Ostrea lugubris, 53 Pinus attenuata, 67 Outwash, 12 Pinus quenstedti Heer, 51 ovatus, Baculites, 55 Pinus sp., 67 Overland Mountain surfaces, 147 Placer gold mines, 12, 73, 77 Oxytoma (Pteria), 56 planimarginata, Nuculaf, 56 Plant remains, 98 Palaeolagus sp., 66 Platanus coloradensis Knowlton, 59 Paleogeographic elements, 133 Platanus coloradensis Lesquereux, 59 Paleontiscus, 41 Platanus guillelmae Goeppert, 59 Paleozoic and later sedimentary rocks, 32 Platte Gulch, 76 Paleozoic history, 133 Platte River, 8,11,52,76,124,146 Palm, cf. Sabal montana Knowlton, 57 Platte River mountains, 8 Park Gulch, 10, 15, 114 Platte River valley, 73 Parker Gulch, 144 Playa basins, 146 patentissima, Diplotmema, 40 Pleistocene, 141 Patton, 128 Pleistocene sediments, 72, 112 Peabody Switch, 56,80,114 Pliocene, 72, 141 Peale, 61,120 Pliocene sediments, 148 Pecopteris (Danaeites) sp., 46 Poacordaites sp., 46 Pecopteris foeminaeformis (Schlotheim) Sterzel, Polygyra (?) leidyi, 66 46 Polypora sp.?, 45 Pecopteris pinnatifida Gutbier, 46 Pony Creek, 79 Pediment, 8, 11, 12, 13, 70, 72, 73, 79, 80, 141, Pony Spring, 43 144 Pony Spring siltstone, 43, 44, 46 Pegmatites and pegmatization, 21, 22 Section, 152 Creek, 37, 40 Pony Spring Syncline, 119 Pennsylvania Gulch, 11 Populus nebrascensis Lesquereux, 59 Pennsylvania Mountain, 6, 128 Poroblattina arcuata Scudder, 45 Pennsylvanian, 47 Poroblattina. lakesii Scudder, 45 Pennsylvanian fossils, 42 Porphyries of the Leadville and Alma mining Permian, 47 districts, 92 Permian fossils, 42 Porphyries of the Little Black Mountain type, permianensis, Rivularites, 46, 47 92 Permo-Pennsylvanian sediments, 33 Porphyries of Northern South Park, 84 persistens, Etoblattina, 45 Porphyry, 82, 94 Petrablattina meieri Scudder, 45 Petrablattina sequa Scudder, 45 Porphyry ridges, 82 Phycoceras sp.?, 55 Post-Antero deformation, 140 Physiographic features, 5 Postglacial processes, 145 Physiographic features in Arkansas valley, Post-pre-Cambrian igneous rocks, 81, 94 comparison with, 80 Powers, 73, 75, 80, 147 Pierre shale, 10, 49, 54, 81, 82, 84, 101, 102, Pre-Cambrian rocks, 17, 111, 112 112, 114, 115, 117, 119, 125, 131, 135 Pre-Cambrian history, 132 Age and general relations, 55, 56 Pre-Cambrian structural features, 110 Fossils, 55 Precipitation, 13 General description, 54, 55 Alma, 13, 14 Thickness, 55 Como, 13, 14 granite, 17, 19, 20, 111, 112, 133 Hartsel, 13, 14 Distribution and general character, 19 Pre-Illinoian (?) stage, 76 Intruded by Silver Plume granite, 21 Pre-Illinoian (?) terrace gravels, 72 Origin, 21 Pre-Pennsylvanian Paleozoic formations, 33, 36

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Pre-Pennsylvanian sediments, thickness of Sangre de Cristo Mountains, 41 Alma district, 38 Sanidine trachyte, 99 Pre-Wisconsin glacial deposits, 73, 78 Sawatch physiographic history, 75 Princeton batholith, 84 Sawatch quartzite, 128 Prinonocyclus sp.?, 53 , 19, 22, 73, 111, 112, 135 Productus semiretictdaris, 45 Scaphites nodosus var. brems, 55 Productus sp.?, 45 Scdphites cf. ventricosus, 53 pseudopopulus, Ficus, 59 schimperiana (?), Sphenopteris, 46 Pseudosuccinea venusta, 66 Schistosity, 21 Pteria (Oxytoma) nebrascana Evans and Scolecopteris degans Gutbier, 46 Shumard, 56 Scudder, 67 Pugnellis cf. fusiformis, 53 Scutinoblattina brongniarti Scudder, 45 Puma Hills, 8 Scutinoblattina intermedia Scudder, 45 purdonensis, Quercus, 59 Scutinoblattina recta Scudder, 45 Purgatory Gulch, 79 Schwade, I. T., 3 Pyrifusus newberryi Meek and Hayden, 56 Sedimentary formations exposed in South Park, 34 Quartz diorite porphyry, 81 semireticularis, Productus, 45 Quartz monzonite, 82, 83, 85 sequa, Petrablattina, 45 Quartz monzonite porphyry, 81, 82, 83 Shark, 53 quenstedti, Pinus, 51 Sheep Creek, 78, 128 Quercus, sp., 67 Sheep Mountain, 74, 92 Quercus purdonensis Knowlton, 59 Shermanophycus gouldi Johnson, 41 Sibillariostrobus hastatus, 46 Rainwater, 106 Sigillaria sp.?, 46 , 15 Silicified wood, 37, 46, 69 Rasin, 98 Sill-like mass, 82, 86 Read, C. B., 40 Silver Plume batholith, 110, 111 recta, Scutinoblattina, 45 Silver Plume granite, 16, 17, 19, 20, 21, 22, 111, Red beds, 45 112, 133 Red Hill, 51, 52, 53 Singewald, 35, 77, 92, 93, 128 Red Hill Gap, 12, 47 Sink holes, 44 Red Hill Pass, 10, 12 Slickensides, 117, 131 Reeside, 48, 56 Slope, average, 10 Reverse faults, 120 Smyth, 99 , 95 Snowfall, 14 Rivularites permianensis White, 46, 47 Snowstorm placer mine, 73 Rock Creek, 15 Snyder Creek, 120 , 48 Solution, 17 rockymontanus, Adiantites, 40 South dome, 119 Rosenbusch, 99 South Fork, 15 rotundata, Neorthroblattina, 45 South Mosquito Creek, 75 Russell, L. S. 66 South Park Dredge Company, 78 South Park fault, 115, 123, 126, 132, 136 Sacramento Gulch, 11, 76 South Platte River, 8, 10, 15, 52, 53, 69, 73, Saddle Mountain, 8, 13, 103, 106 74, 75, 76, 77, 78, 101, 106, 141, 142, 145 Salida, 80, 148 Flow, 15 Salt, 44 Sphenophyllum obovatum Sellards, 46 Salt Creek, 35,38, 39,40,42,43, 44, 93 Sphenopteris asplenoides, 40 Salt Creek plug, 94 Sphenopteris cheathami, 40 Salt Creek porphyry, 93 Sphenopteris dentata Fontaine and White, 46 , 74, 76 Sphenopteris gutzholdi Gutbier, 46 Sandblast, 72 Sphenopteris lebachensis Weiss, 46 Sangre de Cristo formation, 41 Sphenopteris schimperiana ?, 46

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Sphenopteris ci., microcarpa, 40 Titanothere, 66 Spilite, 99 , 99 Spiloblattina gardineri Scudder, 45 Trachyte and related rocks, 61, 68, 81, 87, 99, Spiloblattina guttata Scudder, 45 105, 138 Spiloblattina marginata Scudder, 45 Age and source, 109 Spiloblattina triassica Scudder, 45 Composition, 105 Spinney Mountain, 32, 51, 121 Petrography, 107 Spirifer sp., 45 Relation to other rocks, 106 Spirifer cf. triplicata, 45 Trachydolerite, 87 Spring dome, 119 Triangulation Station No. 2, 95 Spurr, 17, 19, 21, 22, 81, 110, 126 Triassic, 47, 134 Squamularia sp.?, 45 triassica, Anthracoblattina, 45 Stark, 19,99,133,136 triassica, Spiloblattina, 45 Stigmaria verrucosa, 40 Trichopitys whitei, 40 Stoll Mountain, 8 Trigonia, cf. osborni, 66 Strath, 147 triplicatus, Spirifer (cf.), 45 Stratigraphic column of Mosquito Range, 37 Trout Creek, 9, 11, 15, 33, 38, 54, 55, 93, 125, Streams, 15 128,145 Stromatolithic intrusion, 18 Trout Creek fault, 127 Structure, 8,110,112 Trout Creek Pass, 9, 38, 40, 43 Stylopkucus calcarius Johnson, 41 Trout Creek valley, 10, 40 Stylophucus carbonarius Johnson, 41 Trump formation, 70, 113, 118, 141 subcrenulata, Odontopteris, 46 Age and general relations, 70 Sulphur Mountain, 52, 121 Description, 70 Summary of glaciation and glacial deposits, Fanglomerate, 142 144 Thickness, 70 Sundance and its fauna, 48 Tuffs, 58, 81, 95 Tumble Creek, 78, 92, 93 , 10, 12, 15, 58, 73, 74, 75, 76, Twelvemile Creek, 80 79, 80, 111, 141, 142 Twin Bridges, 46 Tarryall district, 86 Tyrrell, 90 Tarryall Gulch, 73 Tarryall Mountains, 8 Ulmannia, 46 Tellina equilaleralis Meek and Hayden, 56 Ulmus sp., 67 Tellina sp., 53 Unconformity, 47, 48, 50, 53, 57, 59, 62, 69, 70, Temperature, Alma, 14 72 Ten Mile Range, 19 Upper Flattop surface, 147 Tenmile district, 42 Terrace levels in Arkansas River valley, 80 Valvata craterella, 66 Tertiary erosion surface, 44 Van Tuyl, 142,147,149 Tertiary extrusive rocks, 96 vanuxemi, Inoceramus cf., 55 Tertiary history, 137 Variolites, 95, 99 Tertiary sediments, 57, 106, 140 Vegetation, sparseness of, 10 Thirtynine Mile andesites, 81, 138 ventricosus, Scaphites cf., 53 , 8, 13, 101, 102, venusta, Pseudosuccinea, 66 106, 109 verrucius, Calyptophycus, 41 Thirtynine Mile volcanic series, 101, 102, 106, verrucosa, Stigmaria, 40 110 Vertebrate footprints, 46 Age and source, 103 Ver Wiebe, 133 Petrography, 102 Volcanic ash, 61 Relations to other rocks, 102 Volcanic , 116 Thomasites sp., 52 Volcanic hills, 10,13 Threemile Creek, 102 Volcanic rocks, 58, 81, 95, 126 Thrust fault, Elkhorn, 12 Volcanic , 11

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Voltzia, 46 Westgate, 80 Vulcanism, 138 Weston fault, 127 Weston Pass, 15, 127 Wagontongue Creek, 68, 69 Whale Peak, 8 Wagontongue formation, 67, 68, 70, 113, 118, White, David, 41, 46 141, 147, 173 White River, 63 Age and general relations, 69 whitei, Cardium, 56 Description, 69 whilei, Trychopitys, 40 Fossils, 69 Wilkerson Pass, 16, 19, 20, 21, 105, 111 Thickness, 69 Williams Range thrust, 121 Walchia, 46 Wind abrasion, 12, 145 Walchia gracilis, 46, 47 Winds, 15 Walchia hypnoides Brongniart, 46 Wisconsin: Description of individual areas, 76 Walchia piniformis Schlotheim, 46 Wisconsin: General distribution, 74 Washburne, 56, 57, 115, 120, 122, 123 Wisconsin drift, 74, 76, 77 Weber (?) formation, 33, 42, 47, 106, 128 Wisconsin glaciers and glacial stage, 12, 74, 75, Age and correlation, 41 76, 77, 80, 144 Coffman conglomerate member, 40 Wisconsin moraines, 73, 74, 75, 76, 77, 78, 79, Distribution, 33 80, 144 Fossils, 40 Wisconsin outwash and terrace gravels, 10, 74, Lower shale member, 37 76, 77, 78, 79, 80, 143, 145, 146 Middle shale and limestone member, 38 Woodwardia latiloba serrata Knowlton, 59 Proposed classification in South Park, 39 Section east of Coffman Ridge, 150 Yosemite Valley, 76 Section at Horseshoe Mountain, 151 Subdivisions and general character, 35 Zeolitization, 89 weberensis, Lepidostrobus, 40 Ziegler, 136

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