BULL. GEOL. SOC. AM. 



VOL. 24, 1912, PL. 28 



Figure 1. — Southwest Side of Doubletop Mountain in the Gros Ventre Range 



Tbe cliff-making layer at the top is the Bighorn dolomite. It is underlain here by Cambrian shale and 

 limestone and pre-Cambrian granitic rocks 



This wall is in 



J'i'-i i;k 2. Wall op Bighorn Dolomite 



valley of Birch Creek near the north end of the Teton Range. The shaly Devonian 

 bods and the Madison limestone are seen above and to the left 



DOUBLETOP MOUNTAIN AND WALL OF BIGHORN DOLOMITE 



