WYOMING ROCKIES 



387 



Earliest known locally- 

 derived conglomerate 



■ 



Figure No. 3, LATE LOWER EOCENE TIME 



^0^^aI^>:v/:v^^\^kv 



Figure No. I, LATE UPPER EOCENE TIME 



Figure No. 3, PRESENT TIME 



Fig. 24.20. Idealized evolution of Medicine Bow Mountains, Wyo. Reproduced from Knight, 1953. 



At the north end of the Laramie basin is a belt of folds arranged en 

 echelon. The belt is on the easterly projection of the Sweetwater uplift, 

 and the direction of the fold axes in the en echelon belt is northeasterly. 

 Jurassic and Triassic rock is exposed in the cores of the anticlines, and on 

 the north they are blanketed with the Oligocene White River beds. 



The evolution of the Medicine Row Mountains in Cenozoic time is 

 shown in Fig. 24.20. 



HARTVILLE UPLIFT 



The Hartville uplift is a northeast arm of the Laramie Range, and 

 connects it effectively with the Rlack Hills uplift. The Laramie Range is 

 a broad, flat-topped anticline, or uplifted plateau with bounding mono- 

 clinal flexures, and so also is the Hartville uplift, if viewed from the south 

 end of the Powder River basin to the Great Plains. See cross section of 

 Fig. 24.14. The Hartville uplift is broadest at its junction with the Laramie 



