132 
ON THE GEOLOGY AND NATURAL HISTORY 
MINERALS AND GEOLOGICAL 
SPECIMENS, continued. 
13. 
14, 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
25. 
26. 
21. 
28. 
29. 
30. 
31. 
32. 
33. 
34, 
35. 
36. 
37. 
38. 
39. 
393. 
40. 
Al. 
42. 
43. 
AA, 
45. 
46. 
4t. 
48. 
49. 
89, 
90. 
91. 
92. 
93. 
94, 
Mica slate, 
Hornblende rock in granite, 
Red felspar from No. 14, 
Crystalline quartz from No. 14, 
Flesh-colored felspar from No. 14, 
Mica slate, with garnets, . 
Mica slate, with garnets, . 
Mica, containing iron, . ° ° 
Flesh-colored felspar in large crystals, 
Chlorite slate, . . 
Mica slate, 
Granite, coarse, over No. 23, 
Felspathic granite, pink, 
Quartz veins in No. 25, 
Hornblende rock, masses in granite, 
Granite, fine-grained, 
Hornblende rock, 
Hornblendic granite, 3 
Hornblende, with erystals of fates 
Mica slate, hornblendic, 
Mica slate, hornblendic, 
Mica slate, with large plates of mica, 
Granite, white felspathic, . ° 
Quartz, veins in No. 35, . . 5 
. Laramie hills. 
Silicious limestone, Silurian or Devonian, . 
do. highly crystalline, 
do. do. 
Syenite, pink, under No. 39, . 
Metamorphic silicious limestone, 
do. do. 
Quartz, in granite, . 
Metamorphic limestone, gray, . 
Mica slate, 
Micaceous granite, . 
do. 
Mica slate, fine-grained, 
Metamorphic limestone, crystalline, . 
do. purplish, 
SILURIAN AND DEVONIAN. 
purplish, 
. Rawhide butte. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
50. 
51. 
52. 
53. 
54, 
55. 
56. 
57. 
58. 
59. 
60. 
61. 
62. 
63. 
64. 
65. 
66. 
67. 
68. 
69. 
70. 
71. 
72. 
73. 
74, 
75. 
76. 
11. 
78. 
79. 
80. 
81. 
82. 
83. 
84. 
85. 
86. 
87. 
Metamorphic limestone, similar to No. 48, Rawhide butte. 
Talcose slate, . . 5 9 5 do. 
Felspathic granite, flesh- sleet 0 . do. 
Mica slate, with garnets, . : 0 0 do. 
do. very fine-grained, . 6 0 do. 
Talcose slate, dark, . 5 ‘ : : do. 
do. light, . 0 5 z ° do. 
Porphyritic trap, . Black hills. 
Hornblende slate, . . ° : : do. 
Felspathic granite, pink, . cl do. 
Plates of mica from No. 59, . 0 0 do. 
Quartz vein in chlorite slate, . 0 2 do. 
Chlorite slate, . 0 . , 0 0 do. 
Trachyte, . 0 3 ° 0 do. 
Quartz veins in No. 63, . - 2 do. 
do. 0 . ° . do. 
Chlorite slate, . 0 0 | He yale butte, 
Hornblende rock, we pie 0 do. 
Schorl in quartz from clay slate, - Black hills. 
do. do. E 0 do. 
Augite, . : : : 5 : 0 do. 
Quartz, with felspar, . Laramie hills. 
Porphyritic trap, columnar, . ° 0 | idee ey 
Black hills. 
do. do. o 5 6 do. do. 
do. do. a : 0 do. do. 
Trachyte, 0 0 : 0 . ° do. do. 
Vesicular trap, 0 et, eae : do. do. 
Trachyte, . ° 0 ° 0 5 do. do. 
. Rawhide butte. 
| Stone butte, 
: Black hills. 
- Bear peak, do. 
Silicious limestone, . 0 . 
Porphyritic trachyte, . 
Compact trachyte, with scales of mica, 
do. do. do. do. do. 
Gray basaltic trap, . 0 0 . 3 do. do. 
Porphyritic trachyte, ¢ - . : do. do. 
do. 0 : 0 0 do. do. 
Quartzite, . . 0 9 0 0 do. do. 
Gray trachyte, . c 2 : 9 a do. do. 
Metamorphic sandstone, . 0 0 0 do. do. 
II. SEDIMENTARY ROCKS. 
Potsdam sandstone, red, with Lingulaantiqua Bear peak. 
do. gray, fine, with Obolus, 
do. porous, with Trilobites, 
Metamorphic, conglomerate over granite, 
do. with cherty pebbles, 
do. do. 
do. 
do. 
. Laramie hills. 
do. 
do. 
95. 
96. 
Diffs 
98. 
995 
Argillaceous limestone, Devonian, - Laramie hills. 
Metamorphic conglomerate, . 0 do. 
CARBONIFEROUS. 
Limestone, with spirifer, . . Black hills. 
do. 
do. with corals, . > do. 
Blue cherty limestone, with Athyris subtilite 
