EAWLINGS PEAK. 163 



portion, and of a deep Indian red, and frequently thinly bedded, and of 

 much finer texture toward the base. About midway in these sandstones is 

 a bed of about a foot in thickness of a pale greenish drab, compact, litho- 

 graphic limestone, enclosed in beds of purple and green argillaceous clays 

 and shales. This bed seems very persistent throughout this formation east 

 of the Wahsatch Kange. At the base of the series is a gray sandstone, 

 rather thin-bedded, with very regular jointing planes. The red sandstones 

 are overlaid by about a hundred feet of red and white, soft, argillaceous beds, 

 including thin seams of arenaceous shales. Above these were found two 

 outcrops of limestone, a dark, earthy bed of 10 feet, overlaid by 15 feet of 

 gray, somewhat arenaceous limestone. In these were found the following 



Camptonedes hellistriatus. 



extenuatus. 



pertenuistriatus. 

 Belemnites, sp. f 

 Eumicrotis, sp. 1 

 Astarte, sp. f 



Adjoining these limestones, the outcrops were too much covered to 

 make it certain that 25 feet is the maximum development of Jurassic lime- 

 stone here. No other outcrops were observed, though in the gap of nearly 

 a hundred feet between them and the characteristic conglomerate of the 

 base of the Cretaceous, which shows on the surfaces only fragments of thin 

 sandstones and rusty shales, there may be some limestone beds hidden. 

 Beyond the outcrop of the Dakota conglomerate, which is here white, the 

 successive ridges are occupied by beds of the higher groups of the Creta- 

 ceous, still conformable, but with ever decreasing angle of dip. To the 

 westward, the high plateau region is occupied by nearly horizontal beds of 

 the Laramie group. 



Along the line of the railroad, west of the gap near Rawlings Station, 

 the first prominent outcrops are seen in low ridges of shales of the Colorado 

 group, overlaid by .white sandstone beds dipping westward, which, to the 

 north, have a strike of nearly north and south, while beyond the railroad to 

 the south they bend eastward, assuming a trend of south 70° east. Above 

 these, the series of heavy-bedded white sandstones of the Fox Hill group is 



