3i8 ELIOT BLACKW ELDER 



Near Anchor, on the north side of the Owl Creek Range, the 

 most conspicuous tabular hills stand about 150 feet above the 

 present valley bottoms (Fig. 37), 



In Jackson Hole the low hills scattered about the southern end 

 of the basin are not flat-topped, but their surfaces are only gently 

 undulating and appear to represent late mature topography of an 

 earlier cycle. Corresponding to the tops of these hills are wide 

 flat-bottomed valley heads in the adjacent foothills, and all about 



Fig. 36. — Mesas and terraces of the Circle cycle cut across inclined Mesozoic 

 strata in the Shoshone Indian Reservation. The higher surface at the right may 

 represent the Black Rock cycle. 



150-400 feet above the bottom of Jackson Hole. These and 

 similar features along the west slope of the Teton Range may 

 correspond in age and represent the Circle cycle, although the cor- 

 relation at such a distance is far from assured. Northeast of the 

 new town of Tetonia, at the north end of the Teton basin in Idaho, 

 there are low, nearly flat-topped mesas which have been dissected 

 to a depth of 100-200 feet by the streams which excavated the 

 bottom of the Teton basin. These features again are of the same 

 order of magnitude, and have the same general relations as those 

 typical of the Circle cycle. The Circle floodplains were once two 



