134 
ON THE GEOLOGY AND NATURAL HISTORY 
MINERALS AND GEOLOGICAL SPECIMENS, continued. 
1G8. 
Arenaceous limestone (No. 166), with 
203. 
Whitish pulverulent sandstone, overNo. 199, Sioux city. 
leaves of Credneria, Melanias, &c., 
Bad lands of J uditli 
204. 
do. fine-graiued under No. 199, 
Blackbird hill. 
169. 
Indurated ferruginous clay, with Melanias, 
do. 
205. 
Indurated clay, bluish, .... 
do. 
170. 
Ferruginous sand, with TJnio danai, 
do. 
206. 
do. yellow, .... 
Decatur. 
171. 
Indurated clay, with Melanias and scales 
207. 
do. do. . 
do. 
of Lepidotus above No. 166, 
do. 
208. 
Ferruginous sandstone, with striated bi- 
172. 
Shell limestone, containing Melanias, 
do. 
valves, and Cytherea arenaria, . 
Big Sioux. 
173. 
Impure sandy lignite (stratum D of section), 
do. 
209. 
Indurated clay, with dicotyledonous leaves, 
do. 
174. 
Shell limestone, same as No. 172, . 
do. 
210. 
do. sand, fine,yellow, with leaves 
175. 
Cream-colored shale, burnt from over lig- 
of salix,. 
do. 
nite beds, ...... 
do. 
211. 
Ferruginous sandstone, .... 
( Mouth ot Iowa 
(creek. 
176. 
Compact argillaceous limestone, with Cy- 
212. 
do. do. fine-grained, with 
iherea Oiceni (marine), beneath fresh- 
impressions of dicotyledonous leaves, 
Mouth Big Sioux. 
water beds,. 
do. 
213. 
do. with Solen Dacotaensis, 
do. 
177. 
Ferruginous sandstone, with Tellina sub- 
214. 
Lignite under No. 209, .... 
do. 
tortuosa, . 
do. 
215. 
Silicified wood, bored by teredo, 
Big Sioux. 
178. 
Rough, gray, limestone, with Ostrea glabra, 
do. 
216. 
do. do. 
Blackbird hills. 
179. 
Ferruginous sandstone, with Inoceramus 
217. 
do. do. 
Smoky hill fork. 
pertenuis, upper marine strata, 
do. 
218. 
do. do. 
Republican fork. 
180. 
Lignite, over No. 179, 
do. 
219. 
Coarse, ferruginous sandstone, with leaves 
181. 
Carbonaceous sand from decomposition of 
lignite bed over No. 179, 
( Rocky mountain 
{ creek. 
220. 
of Credneria, . 
Sandstone, very ferruginous, 
Smoky hill, 
do. 
182. Impure shaly lignite, with selenite, . 
Near Ammel’s Is. 
221. 
Cellular, ferruginous, rock, 
do. 
183. 
Limestone, with Cypris, lower part of for- 
184. 
mation No. 1, .... 
Silicified wood, ferruginous, 
Black hills,E. base, 
do. 
Formation Mo. 2. 
185. 
do. coniferous, 
do. 
222. 
Masses of sulphuret iron, with sulphate, . 
Mouth of Vermi- 
186. 
Bone of saurian, ..... 
do. 
223. 
Crystallized do. do. 
do. [lion. 
187. 
do. or cetacean, 
do. 
224. 
do. gypsum, . . . . 
do. 
188. Dense ferruginous sandstone, . 
Blackballs,W. base 
225. 
do. do. . 
dg- 
189. 
Quartzose sandstone, bluish, . 
do. 
226. 
do. in plates, .... 
do. 
191. Conglomerate from junction of cretaceous 
227. 
Large crystals selenite, in black clay, 
do. 
and carboniferous rocks, 
Platte valley. 
228. 
do. do. do. 
do. 
192. 
Coarse ferruginous sandstone, with peb- 
229. 
Ferruginous shale, with remains of fishes,. 
do. 
bles, over No. 199, .... 
do. 
230. 
do. shell limestone, . 
do. 
193. 
Dark ferruginous sandstone, over No. 192, 
do. 
231. 
Yellow clay, with gypsum, 
do. 
194. 
do. containing much iron, 
do. 
232. 
Conglomerate, with green silicious pebbles, 
do. 
195. 
do. do. 
do. 
233. 
do. with shark’s teeth, 
do. 
196. 
Ferruginous sandstone, .... 
Blackbird hill. 
234. 
Gray arenaceous limestone, with Cytherea 
197. 
do. fine-grained, . 
Mouthof Elk Horn. 
orbicidata. 
do. 
198. 
Dark, coarse, sandstone, very ferruginous, 
do. 
235. 
do. do. with fish-scales. 
do. 
199. Red, ferruginous sandstone, with many spe- 
236. 
Dark gray indurated clay, with fish scales, 
Black hills,E. base. 
cies of dicotyledonous leaves, 
Black hills. 
237. 
Arenaceous limestone (No.234), with Ser - 
200. 
do. do. 
pula, ....... 
Dixon’s bluffs. 
201. 
Light gray quartzose sandstone, with balls 
238. 
Conglomerate, with fish teeth, . 
do. 
of sulphate of iron over No. 199, 
do. 
239. 
Arenaceous limestone, gray, with Inocera- 
202. 
do. with dicotyledonous leaves, 
do. 
mus problematicus, .... 
Blackhills,W. base 
