552 



D. F. HEWETT 



Another similar spring lies about 3,000 feet southwest at a lower 

 elevation. These springs appear to be supplied from a thin mantle 

 of mingled limestone breccia and sand from the Wasatch beds 

 that becomes sufficiently saturated with water during the wet season 

 to yield a small flow throughout the year. No other perennial 

 springs are known within ten miles. 



Fig. 4. — Bighorn limestone (?) overlying Wasatch (or Bridger?) beds on a hill 

 near East Peak, McCuUock Peak region, near Cody, Wyoming. 



The significance of the McCullock Peak exposures may be 

 briefly summarized. Before Dake's work was done in 1916, the 

 McCullock Peak exposures might have been as puzzling as Heart 

 Mountain to the geologists who examined that region some years 

 ago (5, 6), and who considered that the block of Madison limestone 

 which forms its summit was a plug bounded by a circular fault. 

 In the light of Dake's work, there can be little doubt that the blocks 

 of limestone in the vicinity of South Peak are parts of a layer of 

 limestone that was thrust from the west, probably from the region 



