CONTENTS IX 



Figure Page 



38. Geologic map of the Uinta Range, showing the Tertiary sediments of the Bridger Basin, Wye, at the north, and of the 



Uinta Basin, Utah, at the south 52 



39. Chronologic relations of formations in the mountain-basin region 54 



40. Section of deposits near Barrel Springs, Washakie Basin, Wyo 55 



41. Eocene and lower Oligocene mammalian life zones in eleven typical correlated areas in New Mexico, Colorado, Utah, 



Wyoming, South Dakota, and Montana 59 



42. Section of Upper Cretaceous and basal Eocene (Fort Union) deposits in Sweet Grass County, Mont 61 



43. Section of Eocene deposits in the San Juan Basin, N. Mex 62 



44. Columnar section of Cretaceous and Eocene sediments exposed along Bear River, Wyo., showing the typical Wasatch 



group of Hayden 66 



45. Generalized section through Upper Cretaceous and basal and lower Eocene deposits near Pumpkin Buttes, Powder 



River Valley, Wyo 68 



46. Composite section of the Eocene deposits of the Big Horn and Clark Fork Basins, Wyo 70 



47. A typical "Lost Cabin" locality. Alkali Creek, Wind River Basin, Wyo 71 



48. Section through the Wind River formation (lower Eocene) near Lost Cabin, Wyo 72 



49. Map showing cluster of lower, middle, and upper Eocene sedimentary basins in southwestern Wyoming and northern 



Utah, exhibiting parts of areas of the Wasatch, Wind River, Bridger, and Uinta formations 73 



50. Sketch map of the region of the Huerfano and Cuchara formations in southern Colorado 74 



51. Section of the Huerfano formation in southeastern Colorado 75 



52. Section of exposures from lower Eocene to lower Oligocene at Green Cove, on Beaver Divide, Wind River Basin, Wyo_- 76 



53. Section across Wind River Basin, Wyo., from Hudson to top of Beaver Divide 77 



54. Map showing the Eocene sediments encircling the Uinta Mountains of southwestern Wyoming and northern Utah 78 



55. Geologic section of the Bridger formation in the Bridger Basin, Wyo 80 



56. Map of the Bridger Basin, Wyo., and section of the Bridger formation 82 



57. Section of the lower part of the Bridger formation in the Bridger Basin, Wyo 83 



58. Section of the upper part of the Bridger formation in the Bridger Basin, Wyo 86 



59. Section of deposits near Barrel Springs, Washakie Basin, southern Wyoming 87 



60. Section of the Washakie Basin, Wyo., from north to south 88 



61. Sketch map of the Washakie Basin region, Wyo 88 



62. Columnar section of Washakie Basin, Wyo., showing life zones 90 



63. Section of the Uinta formation exposed in the north wall of White River Canyon, Utah 91 



64. Section of the Uinta formation from Kennedy's Basin to White River Canyon, Utah 1 92 



65. Section of the Eobasileus-Dolichorhinus and Metarhinus zones in the Uinta Basin, Utah 93 



66. Badlands near mouth of White River, Uinta Basin, Utah 95 



67. Section of deposits at Green Cove, Beaver Divide, Wyo 100 



68. Section across the Wind River Basin, Wyo., from Hudson to top of Beaver Divide 101 



69. Map showing exposures originally described as the "White River group" by Meek and Hayden 102 



70. Facsimile of the Meek and Hayden Tertiary section of 1862 103 



71. Map showing tributaries of Chej'enne River, S. Dak., and the type locality of the " Titanotherium beds" of Hayden. _ 104 



72. Type locality of the " Titanotherium beds" of Hayden, on Bear Creek, S. Dak 105 



73. Panoramic section of the Big Badlands of South Dakota 106 



74. Section of the Big Badlands of South Dakota, showing the chief faunal zones of the OUgocene (White River group) 



and the Miocene 107 



75. Map showing principal exposures of the Chadron formation 108 



76. Section showing the results of stratigraphic leveling in the Chadron formation (Titanotherium zone) in the badlands 



of White River, S. Dak ■ 115 



77. The family tree of the Perissodactyla 116 



78. Geographic cross section showing the nature of the habitats of the larger existing ungulates and of the titanotheres as 



illustrating adaptive radiation 122 



79. Original radiation of the unguligrade Herbivora, Carnivora, and Insectivora, with adaptations to environment 123 



80. Adaptations in the structure of the skull and teeth of Herbivora to diverse habits of feeding 125 



81. Convergent adaptations in the structure of the limbs and feet of ungulates 125 



82. Adaptive radiation in the feeding habits of antelopes 126 



83. Mauvaises Terres, Nebraska 142 



84. "Vertical view of the posterior tooth belonging to the lower jaw of Mr. Front's Palaeotherium" 143 



85. Original figures of Front's "gigantic Palaeotherium" 143 



86. Osborn's first restoration of Palaeosyops paludosus Leidy 151 



87. Four stages in the origin and evolution of the horns in titanotheres 152 



88. Leidy's cotypes of Palaeosyops paludosus 157 



89. Leidy's type (holotype) of Palaeosyops major 158 



90. Leidy's type of Palaeosyops humilis 159 



91. Leidy's cotypes of Palaeosyops Junius 159 



92. Marsh's type of Palaeosyops laticeps 160 



93. Marsh's type of Telmatherium validus 161 



94. Marsh's type of Limnohyus robustus 161 



95. Cope's cotypes of Palaeosyops vallidens 162 



96. Cope's cotypes of Limnohyops laevidens 163 



97. Cope's type (holotype) of Limnohyus fontinalis ■ — 164 



