218 
Saxicavide, 86. 
Scala, 84. 
Scalaria, 84. 
Scalide, 84. 
Schizodus, 40. 
Scaphites, 73, 82. 
Section of Pliocene beds, 32. 
Section, vertical, of the Cretaceous 
formations of Nebraska, so far as 
determined, 69. 
Section, general, Black Hills, 22. 
Section at Wood’s Bluffs, 8. 
Section of Carboniferous limestones, 
5, 40-52. 
Section Cretaceous rocks, 20, 69, 
70, 72. 
Section of Tertiary beds of O’Fal- 
lon’s creek on the Yellowstone, 98. 
Section Tertiary rocks, 21, 96, 105. 
Selenite, 76. 
Shale, ash-colored, 25. 
Shunganunga mound, 44. 
Shyenne river, 19, 69, 105. 
Siam, 130. 
Silurian, Potsdam sandstone, 21, 26, 
28, 33, 36. 
Similarity of Cretaceous forms to 
Tertiary, 80. 
Simpson, Capt., 126. 
Simpson, Mr, travels in the Hud- 
son Bay territory, 99. 
Sioux City, 10. 
Slates, taleose, 26. 
Slate, argillaceous, 19. 
Slave Butte, 28. 
Smilax, fossil, 98. 
Smith’s, or Kamas river, 121. 
Smithsonian Institution, 3. 
Smoky Hill, 39. 
Smoking-earth river, 78. 
Snake river, 121. 
Snowy Mountains, 34. 
Solarium, 85. 
Soldier creek, 39. 
Solemya, 50, 89. 
Solemyide, 89. 
Solen, 69, 89. 
Solenidae, 87. 
Solidula, 86. 
Solidulide, 86. 
Solidungula, 106. 
Solomon’s fork, 39. 
Southern Africa, 130. 
Spherium, 103. 
ON THE GEOLOGY AND NATURAL HISTORY OF THE 
Spirigera, 5, 6. 
Spoon Hill creek, 14. 
Spontaneous ignition of Lignite beds, 
75, 98, 99. 
Square Buttes, 34. 
St. Louis, 115. 
St. John’s, 10. 
Stansbury’s report, 37. 
Steneofiber, 107. 
Stevens, Gov., 115. 
“Stone Walls,” 125. 
Stratification, cross or false, 7. 
Strombide, 84. 
Sturgis, Dr., 9. 
Stylemys, 107. 
Succinea, 105. 
Sulphur, 76. 
Swallow, Prof., 54. 
Sweet-water Mountains, 119. 
Syenite, 35. 
Synocladia, 46. 
Syringopora, 22. 
‘ancredia, 88. 
Tectura, 85. 
Tekama, 8. 
Tellina, 87. 
Tellinide, ST. 
Terebratula, 22. 
Teredo, 86. 
Terres, Mauvaises, of White river, 3. 
Tertiary, 12,.15, 16, 21, 29, 33, 
92, 124, 125, 129, 130. 
Tertiary Basins of the Upper Mis- 
sourl, 92. 
Tertiary Basin of White and Nio- 
brara rivers, Les Mauvaises Ter- 
res, 104. 
- Tertiary deposits, Loup fork group, 
12, 14. 
White river group, 16, 20,21, 27. 
Tertiary beds jutting against older 
rocks, 19, 35. 
Testudo, 107. 
Testudo Nebrascensis, 14. 
Teton river, 69. 
Tetralophodon, 106. 
Teuthide, 81. 
Thespesius, 101. 
Thracia, 87. 
Thunder Butte, 99. 
Titanotherium, 106. 
Titanotherium bed, 29, 30, 31, 32. 
Tongue river, 119. 
Topeka, 43. 
UPPER MISSOURI. 
Trap dikes, 35. 
Triassic, or New Red Sandstone, 
123. 
Trilobites, fragments of, 26, 111. 
Trois Tetons, 119. 
Tubicola, 81. 
Turbo, 85. 
Turbonilla, 84. 
Turrilites, 83. 
Turris, 84. 
Turritella, 84. 
Turritide, 84. 
Turtle River, 33. 
Turtle Hill, 33. 
Ulmus, fossil, 98. 
Unio, 108, 110. 
Unionide, 103. 
United States, 38. 
Upper Missouri country, 1, 73. 
Upper Mill creek, 45. 
Valvata, 102. 
Valvatide, 102. 
Vaughan, A. J., 4. 
Vermetes, 25. 
Vermilion creek, 47. 
Veneride, 88. 
Venus, 88. 
Vertebrata, 91, 106. 
Vivipara, 101. 
Viviparide, 101. 
Wabounse, 57. 
War Department, 115. 
Warm Spring, 15. 
Warren, Lieut. G. K., 12, 18, 36. 
Wasatch Mountains, 119. 
White river, Bad Lands, 4, 16, 17, 
80, 31, 104, 105, 129. 
White river Valley, 14, 104, 105. 
Willow Springs, 126. 
Wind river, 118. 
Wind river mountains, 118, 119. 
Wolverine, Gudo duscus, 138. 
Wood, silicified, 9. 
Worthen, A. H., 38. 
Wounded Knee creek, 32. 
Aylophaga, 86. 
Xystracanthus, 40, 67. 
Yellow marl formation, 108, 109. 
Yellowstone, 8. 
Yoldia, 90. 
Yucea, 14. 
Zamites, 128. 
Zeandale, 47, 48. 
