Plate 66. A. Oreodon Beds near Big Foot Pass. 

 B. Erosion forms in Corral Draw. 



67. A. Titanotherium Beds near Big Foot Pass. 

 B. Oreodon Beds in Indian Draw. 



68. A. Erosion forms north of the Great Wall near Cedar Pass. 

 B. Erosion forms north of the Great Wall near Big Foot 



Pass. 



69. A. Erosion forms near Sheep Mountain. 

 B. Erosion forms in Corral Draw. 



70. A. Great Wall north of Interior. 

 B. Great Wall north of Interior. 



71. A. Clay balls in small ravine. 

 B. Conglomerate dike in Indian Draw. 



72. A. General view of Titanotherium Beds. 

 B. General view of Oredon Beds. 



73. A. Protoceras Beds near Sheep Mountain. 

 B. Protoceras Beds near Sheep Mountain. 



74. A. Oredon Beds of Indian Draw — Corral Draw divide. 

 B. Erosion detail in School of Mines canyon. 



75. A. and B. Agate Spring fossil quarries. 



76. A. General view of Slim Buttes. 

 B. Fort Union Sandstone of the Cave Hills. 



77. North face of Pine Ridge. 



78. Students studying concretions in Indian Draw. 



79. School of Mines party near top of Sheep Mountain. 



80. Protoceras Beds of Sheep Mountain. 



81. Steep-walled canyons of Sheep Mountain. 



82. Climbing among the precipices of Sheep Mountain. 



83. View across the eastern slope of Sheep Mountain. 



84. View from Sheep Mountain toward White River. 



85. Erosion forms north of the Great Wall near Interior. 



86. Panoramic view South of Sheep Mountain. 



87. Panoramic view of the Great Wall near Saddle Pass. 



88. Roadway through Cedar Pass. 



89. Approaching the top of Sheep Mountain. 



90. General view of School of Mines camping ground. 



91. Midway down School of Mines Canyon. 



92. Near the Gateway, School of Mines Canyon. 



93. Detail of the Great Wall north of Interior. 



94. Protoceras Beds and Oreodon Beds of School of Mines 

 Canyon. 



95. Geological party descending School of Mines Canyon. 



96. A guardian of the Gateway, School of Mines Canyon. 



