1 86 KNOWLTON 



Ficus sp. (Same as found at Forsyth, Montana, and Ceratops beds 



of Converse County.) 

 Viburnum antiquum (Newb.) HoUick. 



2. MILES CITY, MONTANA AND VICINITY. 



In 1907 Messrs. A. J. Collier and C. D. Smith, while engaged in 

 coal classification work, surveyed about 1000 square miles of country 

 comprising the so-called Miles City, Montana, coal field. With 

 the exception of some unimportant alluvial deposits in the valleys, 

 all the rocks of the region were found to belong to the Fort Union 

 formation, which they show is comprised of two members. The 

 lower member, which corresponds to the "Hell Creek beds" just 

 described, is about 500 feet in thickness, but the base is not exposed; 

 however, from the comparison of the Miles City section with that at 

 Glendive, about 70 miles to the northeast, it is inferred that the 

 base is not very deeply buried. Collier and Smith^ give the fol- 

 lowing detailed section of the lower member of the Fort Union for- 

 mation at Miles City, which is here presented entire to show not only 

 the varied character and coloration of the beds but the relative posi- 

 tions of the paleontological material obtained. 



Section of the lower member 0/ the Fort Union formation near Miles City, 



Montana. 



ft. in. 



Limestone at base of up;:er member 3 



Shale, white 7 



Coal and shale, dark 6 



Shale, gray 20 



Limestone, weathering brown i 



Shale, light gray 10 



Shale, dark gray 8 



Limestone, weathering reddish brown 6 



Shale, dark yellow 6 



Coal 6 



Shale, gray 21 



Limestone, weathering light red i 



Shale, gray 25 



Sandstone, white, with limes lone concretions 8 



Shale 2 



Sandstone 8 



Shale, white 2 



" Bull. U. S. Geol. Surv., 341A, 1908, pp. 39, 40. 



