MOOK, STUDY OF THE MORRISON FORMATION 



113 



In eastern Colorado and New Mexico the Pnrgatoire formation overlies 

 the Morrison. In all three of these last-mentioned areas the contact be- 

 tween the Morrison and the overlying formation is sharp. Near Canon 

 City, Colorado, marine fossils of Washita age were found by Stanton in 

 beds immediately overlying ihe Morrison. 



In general, the contact between the Morrison and overlying "beds is 

 sharp, but there is no evidence of a break of any great extent between 





Fig. 79. 



-Sections of the Morrison formation showing decrease in thickness from 

 southivestern Colorado north eastivard. 



A. Telluride quadrangle, Colorado, maximum thickness 900 feet ; B. Encampment Dis- 

 trict, V^'^yoming, thickness 400 feet ; C. Como Bluff, Wyoming, thickness about 200 feet ; 

 D. Devil's Tower, Wyoming, thickness about 100 feet. Scale, 250 feet to 1 inch. 



the two formations. As noted by Lee (1915, 3), the Morrison is much 

 more closely related to the overlying formations than to those under- 

 lying it. 



THICKNESS 



In a general way, it will be noticed, on studying the various sections 

 of the Morrison formation, that the thickness is much greater in the 



