OF THE UPPER MISSOURI. 31 
At another locality the Titanotherium bed at the base consists of clay with a pinkish 
tinge filled with angular grains of quartz and water-worn pebbles, two feet; then a loose, 
incoherent gravel with pebbles three to four inches; then six to eight feet of light gray 
clay filled with pebbles and angular grains of quartz, sometimes forming a quartzose sand- 
stone, passing up into a dark ash-colored clay with a greenish tinge. 
October 8th. Between the Shyenne and White rivers, running through the turtle bed, 
is a seam of fine blue grit, vertical to the rest of the strata. A large number of these 
curious seams occur at different localities, which, doubtless, are caused by fissures in the 
strata being filled with a fine sediment by infiltration. A section of the different beds in 
descending order at this locality would be— 
. Flesh-colored marl. 10 feet. 
Bluish laminated clay with a yellowish tinge. 2 feet. 
. Flesh-colored indurated marl. 15 feet. 
Bed. 
. Light gray, indurated argillaceous grit, forming a conglomerate of nodules of clay. 4 to 6 feet. 
. Flesh-colored indurated grit. 20 feet. 
Bluish argillaceous grit. 10 inches. 
. Flesh-colored marl. 4 feet. 
. Argillaceous grit. 6 to 12 inches. 
. Flesh-colored marl. 30 feet. 
We} ee) S| tery eat CO) ne 
Oreodon Bed. Bed. 
= 
= 
A fine light gray calcareous grit passing down into an ash-colored clay, with micaceous and silicious 
sandstone at base tinged with a purplish hue. 80 to 100 feet. 
rium Bed. 
—s Fe ee 
Titanothe- 
11. Cretaceous beds Nos. 5 and 4. 
In the valley of White river the Cretaceous beds Nos. 5 and 4 are exposed by the erosion 
and removal of the overlying Tertiary strata. No. 5 contains numerous fossils in similar 
tough argillaceous concretions to those observed on the west side of the Shyenne. All the 
calcareous matter has been dissolved away from the fossils, leaving only casts. The upper 
portion presents a variety of lithological characters and is destitute of fossils. 
Section of Tertiary beds on White river near camp. October 9th: 
1. A calcareous grit, the lower portion seeming to contain more sand and less calcareous matter than the upper. 
At this point it has a thickness of about 40 feet, with 40 to 50 feet of Post Pliocene marly grit capping it, 
containing numerous freshwater shells identical with living species, like the Loess or Bluff marl near Council 
Bluffs. A few fragments of turtles and bones and teeth of Oreodon were found in this bed. Bed C, Upper 
Miocene. 
2. Variegated bed, consisting of alternate layers of dark brown clay and light gray calcareous grits, of which I 
counted twenty-one at this locality, varying in thickness from one inch to two feet. 20 feet. 
3. Deep flesh-colored marl, contains many coneretionary layers of light gray sandstone, which gives the bed a 
banded appearance when weathered. The abundance of organic remains commences in this bed and ceases 
at the first dark band at the base of bed 6 above. This bed becomes much more arenaceous towards the base. 
The lower half contains five layers of concretionary sandstone from four inches to two feet in thickness. 48 feet. 
