274 Annals of the Carnegie Museum. 



Hatcher and Stanton consider as most reasonable the view that the 

 Benton "of the western section includes the representatives of both 

 the so-called Fort Benton and the Niobrara of the eastern section." '" 

 The Benton in Other Localities. — On the South Fork of Sixteen 

 Mile Creek, the Benton Beds are somewhat different- from those just 

 described. They consist principally of dark shales and hard greenish- 

 gray sandstones. There are, near the bottom, one or more bands, 

 several feet in thickness, of rotten limestone crowded with shells of 

 mollusca. The beds are much disturbed, sometimes standing ver- 

 tically, or nearly so. Apparently they are quite thick, though no 

 measurements were made. Fossils occur in the limestones, shales, and 

 sandstones. This locality was visited in 1901 by the present writer 

 and numerous fossils were obtained, among which are the following : ^^ 



Itioceranuts iindabundus Meek and Hayden. 



Finn a lakesi ? White. 



Pholadomya papyracea ? Meek and Hayden. 



Scholenbachia shosho7iensis (Meek). 



Scaphites veniricosiis Meek and Hayden. 



Astropecten ? 7nojitanus Douglass. 



Linuparus canadefisis Whiteaves. 



Ostrea ? 



Exogyra. 



Cuculliea. 



Turfite //a. 



Eagle and Claggett Beds. 



Fish Creek Region. — The Eagle and Claggett beds have been de- 

 scribed by Hatcher and Stanton,'^ who consider these, the Judith River, 

 and the Bearpaw Shales as members of the Montana, but leave the 

 question open whether, " the Pierre fills all the space corresponding to 

 that occupied by" these four formations. 



In tracing the overlying Judith River beds to the southeastward 

 from the exposure between Fish Creek and Mud Creek, I observed, on 

 the Big Coulee Creek, vast outcrops of sandstones lying in a nearly 



1" " Geology and Paleontology of the Judith River Beds," Bull. No. 257, U. S. 

 CJeological Survey, p. 64. 



^^^^ AstropecUn? motitanus — A New Star Fish from the Fort Benton, etc.," 

 Annals Carnegie Museum, Vol. II, No. i, pp. 5-8. 



'■"'Geology and Paleontology of the Judith River Beds," U. S. Geol. Surv. Bull. 

 No. 257. 



