644 Ati CREA 
The section by Stanton and Hatcher was made north of the 
Missouri in the disturbed region, but is apparently the normal sec- 
tion corresponding closely to those taken by us on the Judith River, 
at several places south of its mouth. As published, however, 500 
to 700 feet of supposed Bearpaw shales, including light-colored » 
sands and shales at the base, are added by Stanton above the 
Judith River beds. These have not been included by us as they 
were not in his section as shown one mile below their camp but 
were added from exposures noted west of their camp." In some of his 
localities, as on the Birch Creek, he says? ‘‘The overlying Bear- 
paw shales are not represented in this immediate region, having 
been entirely removed by erosion.” In other places what appear 
to be Pierre shales seem to overlie the Judith and there is little 
doubt that in some cases they do actually occur at higher levels, as 
we saw at Mauland, but until a careful areal survey is made of the 
whole region it will be impossible to say whether the beds are below 
and of Belly River age, or whether the case is as at Mauland, where 
the cause of the apparent superposition is one of the numerous faults 
traversing the region. In Dr. Stanton’s section given above there 
is no doubt but that 70 feet or more of the beds referred to the 
Claggett are of Fox Hills age, while the 300-400 feet of dark shale 
immediately below should be referred to the Pierre. These shales, 
Dr. Stanton says, ‘‘weather much as the Bearpaw” and contain 
concretions containing Pierre fossils. Stanton and Hatcher’ say 
in their description of the Claggett: 
In the neighborhood of Judith (old Fort Claggett), where they are well 
exposed, they have a total thickness of about 4oo feet and consist largely of 
dark clay shales with variable intercalated bands and beds of sandstone, 
especially in the upper half. The dark shales of the lower part of the for- 
mation contain many calcareous concretions, which yield Gervillia borealis, 
Baculites ovatus, Baculites compressus, and a few other forms, elsewhere 
regarded as characteristic of the Fort Pierre. The yellowish sandstone beds 
higher in the formation, especially one about 200 feet from the top and another 
near the summit, are often locally very fossiliferous, and bear an invertebrate 
fauna, of which the most conspicuous species are the following: 
t Bull. U.S. Geol. Surv., No. 257, p. 44. 
2 [bid., p. 40. 
3 [bid., p. 13. 
