132 
ON THE GEOLOGY AND NATURAL HISTORY 
MINERALS AND GEOLOGICAL SPECIMENS, continued. 
13. Mica slate, 
14. Hornblende rock in aN 
15. Red felspar from No. 14, ‘ . 
16. Crystalline quartz from No. 14, . . 
17. Flesh-colored felspar from No. 14, ‘ 
18. Mica slate, with garnets,. . . . 
19. Mica slate, withgarnets, . . . . 
20. Mica, containing iron, . 
21. Flesh-colored felspar in <a ctl 
22. Chlorite slate,. =. 
23. Mica slate, F 
24. Granite, coarse, over No. 2 23, 
25. Felspathic granite, pink, 
26. Quartz veins in No. 25, 
27. Hornblende rock, masses in granite, 
28. Granite, fine-grained, . . . 
29. Hornblende rock, .  . 
30. Hornblendic granite, - NaN 
31. Hornblende, with crystals of sisi, 
32. Mica slate, hornblendic, . . 
33. Mica slate, hornblendic, . . . 
34. Mica slate, with large plates of mica, 
35. Granite, white felspathie, . 
36. Quartz, veins in No. 35, . . 
37. Silicious limestone, Silurian or Devonian, . 
. 
38. do. highly crystalline, . . 
39. do. 0. 
39}. Syenite, pink, under No. 39, . 
40. Metamorphic silicious limestone, 
41. do. do. stow 
42. Quartz, in granite, . : oe 
43. Metamorphic wesaeras gray, . 
44. Micaslate, . 
45. Micaceous granite, 
46. do. 
47. Mica slate, index: . 
48. Metamorphic limestone, enietitins, ‘ 
49, 
do. purplish, . 
eran AnD Devontay, 
. Laramie hills. 
do. 
50. Metamorphic limestone, similar to No. 48, Rawhide butte. 
51. Talcose slate, . 
52. Felspathic granite, a oth 
53. Mica slate, with garnets, . 
54, do. very fine-grained, 
55. Talcose slate, dark, . J . 
56, OG. AE Ese, Se ° 
57. Porphyritic trap, 
58. Hornblende slate, . 
59. Felspathic granite, pink, . . 
60. Plates of mica from No. 59, . - 
61. Quartz vein in chlorite slate, 
62. Chlorite slate). . . 
63. Trachyte, . ‘ : . 
64. Quartz veins in No. 63). j 
65. do. . . 
66. Chlorite slate, . . 
67. Hornblende rock, taahiyig re 
68. Schorl in quartz from clay slate, 
69. do. do. 
70. Augite, . oa ok 
71. Quartz, with felspar, : 
72. Porphyritic trap, columnar, . . 
73. do. do. ° 
74, do. do. 
75. Trachyte, : . . 
76. Vesicular trap, eee 
77. Trachyte, : é 
78. Silicious limestone, . 
79. Porphyritic trachyte, , 
80. Compact trachyte, with scales of mica, 
81. 0. do. do. 
82. Gray basaltic trap, . 
83. Porphyritic trachyte, 
do. 
85. Quartzite, . 
86. Gray trachyte, . ° 
87. Metamorphic oe ° 
II. SEDIMENTARY ROCKS. 
89. Potsda ted withLingulaantiqua Bear peak. 
90. do. gray, fine, with Obolus, do. 
$1, porous, with Trilobites, do. 
92. Metalaagnl conglomerate over granite,. Laramie hills, 
93. do. = with cherty pebbles, . do. 
94, do. do. . do, 
95. Argillaceous limestone, Devonian, . 
96. Metamorphic conglomerate, 
CARBONIFEROUS, 
97. Limestone, with Spirifer, . 
98. Bluechertylimestone,with Athyrissubtilita, do. 
9. do. 
with corals, 
Z 0. 
Rawhide butte, 
* |W. side. 
do. 
- Black hills. 
‘ do. 
‘ do. 
. Laramie hills. 
ne bu 
Black hills. 
do. do. 
‘ do. do. 
do. do. 
: do. do 
do do. 
. Rawhide butte. 
Stone butte, 
Black hills. 
. Bear peak, do. 
. do. 0. 
do. do 
do. do. 
= do. do. 
do. do. 
; do. do. 
é do. do 
. Laramie hills. 
. do. 
. Black hills. 
do. 
