80 ANNALS NEW YORK ACADEMY OF SCIENCESI 



Fig. 34. — Outcrop of the Morrison formation near Jensen, Utah. 



MoRRisox Formation in Montana and Wyoming (Except the 

 Black Hills Area) 



central and southern montana 



The Morrison formation has not been mapped or described from many 

 localities in Montana. It occurs in the Great Falls coal field and neigh- 

 boring localities and aromid the northern end of the Bighorn Mountains. 

 It probabl}' occurs elsewhere, but either has not been mapped, has not 

 been separated from the Kootenie, or is buried beneath younger forma- 

 tions. The relation of the Kootenie to the j\Iorrison, and its lithological 

 similarit}', may possibly indicate that the Kootenie may be in part equiva- 

 lent to some parts of the Morrison. 



The Morrison occurs in the Electric coal field, and has been described 

 by Calvert (1912, 2). Calvert gives tbe following section: 



Feet Inches 



Sandstoue, brownish, soft, capped by 1 foot of intrusive 23 



Shale, variegated, and sandstone, alternating, the latter reddish 



broM^i 65 



Intrusive 8' 



Shale, purplish and maroon, alternating with thin reddish-brown 



sandstone 79 



