OF THE UPPER MISSOURI. 
69 
VERTICAL SECTION OF THE CRETACEOUS FORMATIONS OF NEBRASKA TERRITORY, SO FAR AS DETERMINED. 
Subdivisions. 
Localities. 
Estimated i 
thickness. | 
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 
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id 
numerous concretions and a profusion of molluscous 
post, and under the Tertiary at Sage and 
o 
6 
fossils, as Be/emnitella bullosa, Nautilus Delay i, 
Bear creeks; at the head of Teton river 
o 
r-H 
& 
Ammonites placenta, A. lolatus, Scaphites Con- 
and at Long lake on the Missouri. 
O 
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radi, Bacidites ovatus, Ostrea sultrigonalis, and 
O 
o 
a great number of marine mollusca. 
Bluish and dark gray plastic clays, containing 
Around the Black hills; a great area 
Nautilus Delcayi, 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 
6 
other marine mollusca,—remains of Mosasavrus. 
creeks, along the Shyenne at Great Bend; 
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o 
Along the Missouri river, below Fort Pierre, there 
on the Yellowstone and near Milk and 
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is a local bed at the base of No. 4, composed of 
Musselshell river. 
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CO 
dark, very unctuous clay, containing much car¬ 
bonaceous matter, with veins and seams of selen- 
ite, sulphuret of iron, and fish scales. 20 feet. 
Lead gray calcareous marl weathering above to 
In the valley of Old Woman’s creek; 
a yellowish tint; scales and other remains of fishes ; 
at Bear peak; around the Black hills and 
CO 
o 
Ostrea, congesta, passing downwards into 
the sources of the Shyenne ; in the bluffs 
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along the Missouri, from Big Sioux river 
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6 
Light gray yellowish limestone, containing great 
to Great Bend. 
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<2 
numbers of Inoceramus jgroblematicus, Ostrea con - 
gesta, and fish scales. 
Dark gray laminated clay, with teeth and scales 
Old Woman’s creek; Black hills; 
of fishes, Ammonites alpinianus, A. percarinatus, 
along the Missouri river from ten miles 
"o 
c 
Serpula tenuicarinata, Inoceramusproblematicus, 
above James river to Big Sioux river. 
o 
a small oyster like 0. congesta, &c. 
Yellowish and reddish friable sandstone, with 
Old Woman’s creek; Black hills; near 
<D 
alternations of dark and whitish clays. Seams and 
the mouth of Big Sioux river; Lower 
o 
c 
beds of impure lignite, fossil wood, impressions of 
Platte; near Judith river. 
o 
CM 
£ 
dicotyledonous leaves ; Bolen, Pectunculus , Cy- 
o 
prina, &c. Lower Cretaceous. 
o 
o 
r-H 
