STRATIGRAPHIC POSITION OF JUDITH RIVER FORMATION 541 
certainly overlie the Fort Pierre and are of more recent age, although 
this is now very generally believed and may eventually prove to 
be the case.’’* 
During the summer of 1903 Mr. Hatcher and Dr. Stanton spent 
two months in the field study of the Judith River formation; part 
of the time in the Judith basin. The results of their investigations 
were published in Bulletin of the U.S. Geological Survey No. 257, 
1905. In a preliminary statement published in August, 1903,’ 
they restate their belief that the Judith River beds occupy a lower 
position than had usually been assigned them and give a summar- 
ized section which divides the Montana into four formations in 
ascending order as follows: Eagle formation, Claggett formation, 
Judith River beds, and Bearpaw shales. As to the beds which are 
supposed to overlie the Judith River beds and for which the name 
Bearpaw shales is proposed they say: 
They have the lithologic and faunal characters of the typical Pierre but 
represent only a fraction of that formation as usually understood. Beneath 
the light-colored mostly non-marine Judith River beds, is another formation 
4oo0 feet in thickness, which in its lower half resembles the Bearpaw shales and 
yields a few of the same species of fossils. Its upper 200 feet, however, contain 
several sandstone beds which bear a fauna that has hitherto been called “ Fox 
Hills.”” We propose the name Claggett formation for these shales and sand- 
stones underlying the Judith River beds. 
Having in mind the possibility, if not the great probability, 
that the two series of beds, Belly River, and the Judith River with 
which the former was correlated by Stanton and Hatcher, were not 
one and the same, but were entirely distinct formations, and that 
the latter is really the equivalent of the division of the Fort Union 
to which the name Lance has been applied by the U.S. Geological 
Survey, the writer decided to visit the area in which the typical 
Judith River beds are exposed, and in accordance with this decision 
the month of July, 1911, was spent in this area In company with 
Mr. A. C. Silberling, formerly connected with the Carnegie Insti- 
tute of Pittsburgh, and Professor G. L. Wait, of the Lewistown 
t Science, N.S., XVIII (March, 1903), 472. 
2 Tbid., (August 14, 1903), 211, 212. The article was sent in from the field from 
Judith Mountain. 
