240. 
241. 
242. 
243, 
244, 
245, 
246. 
247. 
248. 
249, 
250. 
251. 
252. 
253. 
254, 
255. 
256. 
257. 
258. 
259. 
260. 
261. 
262. 
263. 
264. 
265. 
266. 
267. 
268. 
269. 
270. 
271. 
272. 
273. 
OF THE UPPER MISSOURI. 
MINERALS AND GEOLOGICAL 
135 
SPECIMENS, continued. 
Formation No. 3. 
Soft yellow limestone, with Inoceramus 
problematicus, . . 0 . - Big Sioux. 
Gray marl, with Ostrea congesta, and fish 
remains (base of No. 3), 
do. do. : 
Scale of Cyclocladus in No. 242, 
Fibrous carbonate of lime, with Ostrea con- 
do. 
do. 
gesta attached to surface, - Dorion’s hills. 
Yellow marl, 9 do. 
do. ° 6 - Bijoux hills. 
do. lighter, : do. 
Crystalline carbonate of lime, seamsin marl, do. 
do. do. greenish in marl, do. 
Black plastic clay, upper part of No. 3, . Near BORE hills. 
Shale, argillaceous, with fish remains over 
No. 250, 
calcined by combustion of 
do. 
do. 
No. 250, do. 
Formation No. 4. 
Blue clay, with Piychoceras Mortoni, 
do. 
- Bijoux hills. 
Yellow clay, with crystals of gypsum, 
Whitish alum clay, seams in No. 253. 
Hyd. silicate of magnesia, masses in forma- 
tion No. 4, do. 
Crystals sulphate baryta, . do. 
White aluminous earth in seams, do. 
Aluminous clay (No. 255), do. 
Ferruginous concretionsthroughout F.No.4, _— do. 
Crystalline argillaceous limestone (Cone in 
cone), . . Shyenne river. 
- Fort Pierre. 
- Mouth Shyenne. 
Crystals of selenite in clay beds, 
Selenite and fibrous carbonate lime, . 
Yellow clay, with selenite, 
Dark, argillaceous, shale, with Inoceramus, 
Mouth of Can- 
non-ball river. 
Blue concretionary limestone, with Rostel- 
laria, . - Long lake, Miss. 
do. 
. Fort Pierre. 
Indurated clay, 
Decomposed shale (No. 253), 
Brown hematite, 
do. 
Dog-tooth spar, 
. Big Shyenne. 
do. 
. Mussel-shell river. 
0 . Milk river. 
with carbonized matter and 
more earthy, 
Gray arenaceous limestone, 
do. 
shells, . 
. Mouth Jamesriver. 
- Great bend of Miss. 
. 12 m.ab.Ft.Pierre. 
. Cannon-ball river. 
274, 
275. 
276. 
277. 
278. 
279. 
280. 
281. 
282. 
283. 
284. 
285. 
286. 
287. 
288. 
289. 
290. 
291. 
292. 
293. 
294, 
295. 
296. 
2c 
298. 
299. 
300. 
301. 
302. 
303. 
304. 
305. 
306. 
307. 
Soft argillaceous shale, - Yellowstone river. 
Concretions of compact blue limestone, con- 
taining great numbers of fossils, do. 
do. containing large crustacean 
(undescribed), do. 
Crystallized carbonate of lime, yellow, form- 
. Forks of Shyenne. 
do. 
do. 
. Grand river. 
ing nucleus of concretions, . 
Crystals of selenite, . ° 0 
Blue indurated clay, with fibrous gypsum, 
Dove-colored laminated shale, . 
Petrified wood, bored by Zeredo bisinuata, 
“Cone in cone” (No. 241), 
Indurated clay, with shells, 
. Cannon-ball river. 
. Grand river. 
Soft micaceous sandstone, thin seams in 
. Fort Pierre. 
9 do. 
- Mussel-shell river. 
. Fort Lookout. 
clay bed, 
Vertebra of Mososaurus, . 
Wood bored by Xylophaga Honea 
White aluminous clay, . 
Formation No. 5 
Yellow arenaceous limestone, with Venus, Head of Little Mo. 
do. softer, . do. 
Yellowish calcareous sandstone,with Cyprina Cannon-ball river. 
do. do. decomposed, do. 
Soft fine sandstone, with Rostellaria, do. 
Ferruginous sandstone, with Cytherea, do. 
Silicified wood, with bark, - Long lake. 
do. bored by Zeredo globosa, do. 
TERTIARY. 
A. Lignite Basin. 
Yellow arenaceous clay on Cretaceous rocks, 
Yellowish indurated clay, with freshwater 
shells over No. 296, 
Gray sand, fine, over No. 297, . 
- Long lake. 
do. 
Coarse,gray, calcareous sandstone,w’h fossils, TopofSquare butte 
Softargillo caleareous shale, w’h fossil shells, Thunder butte. 
do. 
do. 
Ferruginous shale, with coniferous plants, 
Dove-colored sandstone, with silicified wood, 
Yellow indurated sand, with estuary shell 
of genus Cyrena, . . Cherry creek. 
Light colored indurated clay, baseofsection, Fort Clark. 
Dark carbonaceous clay, over No. 304, do. 
Lignite, over No. 305, do. 
Dark argillaceous shale, over No. 306, 
