ILLUSTRATIONS 



Plate: i. The Gateway, School of Mines Canyon, Big Bad- 

 lands. 



2. A Preliminary Map of the Badland Formations of 



the Black Hills Region. 



3. Columnar Section of the Black Hills Region. 



4. Idealized Birds-eye View of the Big Badlands. 



5. Early View of the Big Badlands. 



6. General View near the Great Wall. 



7. Fig. 1. School of Mines Camp near Head of 



Indian Creek. Fig. 2. Titanothere Quarry, 

 Valley of Indian Creek. 



8. Fig. 1. General View of Titanotherium Beds, Val- 



ley of Indian Creek. Fig. 2. Erosion Detail of 

 Titanotherium Beds near Big Foot Pass. 



9. Fig. 1. Oreodon Beds west of Sheep Mountain 



Table. Fig. 2. Oreodon Beds, Valley of Indian 

 Creek. 



10. Fig. 1. Protoceras Beds near Top of Sheep Moun- 



tain. Fig. 2. Protoceras Beds near Top of 

 Sheep Mountain. 



11. Fig. 1. View across Sheep Mountain Table. Fig. 



2. Sheep Mountain from Valley of Indian 

 Creek. 



12. The Great Wall. from Saddle Pass near Interior. 



13. Detail of Great Wall near Interior. 



14. Detail of Great Wall near Interior. 



15. Sand-Calcite Crystals from Devils Hill. , 



16. Fig. 1. White River near Interior. Fig. 2. 



Cheyenne River near Mouth of Sage Creek. 



17. Fig. 1. Suncracked Surface of an Alluvial Flat. 



Fig. 2. Spongy Surface of Titanotherium Clay. 



18. Box-shaped Dry Ravine near Interior. 



19. Fig. 1. Clay Balls in Ravine near Big Foot Pass. 



Fig. 2. Conglomerate Dike in Valley of Indian 

 Creek. 



20. Upper Portion of Cedar Pass near Interior. 



21. Fig. 1. The Great Wall between Cedar Pass and 



Big Foot Pass. Fig. 2. The Great Wall be- 

 tween Cedar Pass and Big Foot Pass. Fig. 3. 

 View Showing Contact of Titanotherium and 

 Oreodon Beds. 



