ON THE GEOLOGY AND NATURAL HISTORY 
MINERALS AND GEOLOGICAL SPECIMENS, continued. 
168. Arenaceous limestone (No. 166), with 
leaves of Credneria, Melanias, &e., . Badlands ofJudith 
169. Indurated ferruginous clay, with Melanias, do. 
170. Ferruginous sand, with Unio danai, do. 
171. Indurated clay, with Melanias and scales 
of Lepidotus above No. 166, do. 
172. Shell limestone, containing Melanias, do. 
173. Impure sandy lignite (stratum D ofsection), do. 
174. Shell limestone, same as No. 172, do. 
175. Cream-colored shale, burnt from over lig- 
nite beds, ie Soe do. 
176. Compact argillaceous limestone, with Cy- 
therea Oweni (maririe), beneath fresh- 
water beds, . do. 
177, Ferruginous calamen with Teltina om 
tortuosa, . do. 
178. Rough, gray, ae with nee iets do. 
179. Ferruginous sandstone, with Inoceramus 
pertenuis, upper marine strata, .  . do. 
180. Lignite, over No: 179, . do. 
181, Carbonaceous sand from decmasintion of 
Rocky mountain 
lignite bed over No.179, . . 
182. Impure shaly lignite, with selenite, . . Near Ammel’s Is. 
183. Limestone, with Cypris, lower part of for- 
mation No.1, . . -  « Blackhills,E. base. 
184. Silicified wood, ferruginous, . . do. 
185. do. aaa a é do. 
186. Bone of saurian, . enetiec do. 
187. or aucaa * ‘ . do. 
= Dense ferruginous sandstone, . =. Sly < sip eal 
9. Quartzose sandstone, bluish, . ‘ do. 
ae Conglomerate from junction of cretaceous 
and carboniferous rocks, . .  . Platte valley. 
192. Coarse ferruginous — with peb- 
bles, over No. 199, . do. 
193. Dark ferruginous sandstone, over No. 192, do. 
do. containing much iron, do. 
195. do. do. do. 
196. Ferruginous sandstone, . . . . Blackbird hill, 
197. do. fine-grained, . |. MouthofElkHorn. 
198. Dark, coarse, sandstone, very ferruginous, 
199, — ferruginous sandstone, with many spe- 
cies of dicotyledonous leaves, Black hills, 
200. : do. 
201. Light gray quartzose sandstone, with balls 
of sulphate of iron over No, 199, do. 
_ 202. do, —_ with dicotyledonous leaves, do. 
203. Whitish pulverulent sandstone, over No. 199, Sioux city. 
204. fine-grained under No. 199, Blackbird hill. 
205. Indurated clay, bluish, : do. 
206. do. yellow, . Decatur. 
207. ieee os do, 
208. Ferruginous sandstone, with striated bi- 
valves, and Cytherea arenaria, . 
. Indurated clay, with dicotyledonous leaves, 
do. 
oheehs, =. . . : é 
sand, fine, yellow, with leaves 
. Ferruginous sandstone, 
212. do. do. Sees ak 
pga of dicotyledonous leaves, 
213, do. th Solen Dacotaensis, 
214. Lignite under we 209, . » 
215. Silicified wood, bored by teredo, 
216. do. do. 
217. do. do. ; 
218. do. do. : 
219. Coarse, ferruginous sandstone, with pot 
of Credneria, . y o8 : 
220. Sandstone, very oan 
221. Cellular, ferruginous, rock, 
Formation No. 2. 
222. Masses of sulphuret iron, with sulphate, 
223. Crystallized © do. do. ‘ 
224, do. gypsum, . 
225. do. do. . eee 
226. do. in pla 20"; 
227. Large crystals selenite, in black ia 
228. do. do. do. 
229, Ferruginous shale, with remains of leas. 
230. do. shell limestone, . . 
231. Yellow clay, with gypsum, . . 
232, Conglomerate, with green silicious sible 
do. with shark’s teeth, . 
234, Gray arenaceous limestone, with Cytherea 
orbiculata. 
235. do. do. _ with fish-scales. 
236. Dark gray indurated clay, with fish scales, 
237. Arenaceous limestone — ) with Ser- 
pula, . é ° 
238. Conglomerate, with fish ee 
239, Arenaceous limestone, gray, with pnt 
mus problematicus, 
. Big Sioux. 
do. 
; do. 
Mouth of Iowa 
creek. 
Mouth Big Sioux. 
do. 
do. 
. Big Sioux. 
. Blackbird hills. 
. Smoky hill fork. 
Republican fork. 
Smoky hill. 
do. 
do. 
. Mouth of Vermi- 
do.  [lion. 
Black hills,E. base. 
. Dixon’s bluffs. 
do. 
. Blackhills, W. base 
