OF THE UPPER MISSOURI. 
69 
VERTICAL SECTION OF THE CRETACEOUS FORMATIONS OF NEBRASKA TERRITORY, SO FAR AS DETERMINED. 
a3 
SuBpIvisions. LocaLirigs. Ea 
Ne 
Gray and yellowish arenaceous clays and sand- All around the Black hills and head : 
stones at many localities, very ferruginous, with | waters of the Shyenne, Moreau trading 3 
- numerous concretions and a profusion of molluscous | post, and under the Tertiary at Sage and | = 
S fossils, as Belemnitella bulbosa, Nautilus Dekay’, | Bear creeks; at the head of Teton river | 
A Ammonites placenta, A. lobatus, Scaphites Con- | and at Long lake on the Missouri. = 
radi, Baculites ovatus, Ostrea subtrigonalis, and S 
a great number of marine mollusca. 
Bluish and dark gray plastic clays, containing Around the Black hills; a great area 
Nautilus Dekayi, Ammonites placenta, A. Halli, | around Fort Pierre, and along the Mis- 
Baculites ovatus, B. compressus, with numerous | souri. Under No. 5 at Sage and Bear 
i other marine mollusca,—remains of Mosasaurus. | creeks, along the Shyenne at Great Bend; : 
= Along the Missouri river, below Fort Pierre, there | on the Yellowstone and near Milk and | = 
A is a local bed at the base of No. 4, composed of | Musselshell river. rs 
dark, very unctuous clay, containing much car- 
bonaceous matter, with veins and seams of selen- 
ite, sulphuret of iron, and fish scales. 20 feet. 
3 Lead gray calcareous marl weathering above to In the valley of Old Woman's creek ; 
= | ayellowish tint; scales and other remains of fishes; | at Bear peak; around the Black hills and : 
. |= | Ostrea congesta, passing downwards into the sources of the Shyenne ; in the bluffs - 
se along the Missouri, from Big Sioux river | = 
Z . ; as to Great Bend. 3 
7 Light gray yellowish limestone, containing great - 
& | numbers of Inoceramus problematicus, Ostrea con- 
% gesta, and fish scales. 
Dark gray laminated clay, with teeth and scales Old Woman's creck ; Black hills ; 3 
a of fishes, Ammonites alpinianus, A. percarinatus, | along the Missouri river from ten miles | 2 
z Serpula tenuicarinata, Inoceramus problematicus, | above James river to Big Sioux river. 3 
a smail oyster like O. congesta, Xe. 
Yellowish and reddish friable sandstone, with Old Woman’s creek ; Black hills; near 2 
ost alternations of dark and whitish clays. Seams and | the mouth of Big gn river; Lower S 
S beds of impure lignite, fossil wood, impressions of | Platte; near J udith river. : 
A dicotyledonous leaves; Solen, Pectunculus, Cy- 2 
prina, &c. Lower Cretaceous. an 
