"CERATOPS beds' OF WYOMING AND MONTANA 259 



These fossils were referred by me to the Laramie in 1893, but at 

 that time the Judith River formation was not recognized as distinct 

 from the Laramie. They actually occur at this place in the Claggett 

 with both Judith River and Bearpaw exposed above them in the same 

 section as was observed by R. W. Stone, C. A. Fisher, and myself in 

 1907. The associated conglomerate mentioned by Weed is mostly 

 composed of igneous pebbles but there is no suggestion of an uncon- 

 formity beneath it nor at any other plane within the limits of marine 

 sedimentation. 



With the facts above recited in mind the whole question of the age 

 and relations of the Livingston formation is reopened, and inciden- 

 tally the occurrence of 5 per cent of andesite in the Hell Creek beds 

 recorded by Brown^® loses much of the significance that has been 

 attached to it. Whatever may be true of the Livingston in the type 

 area near the town of that name, the rocks assigned to it by Weed east 

 of the Crazy Mountains, notably in the Lebo Creek section, certainly 

 belong to several distinct formations ranging in age from well down in 

 the Cretaceous to the lower Eocene. 



The rocks immediately overlying the Bearpaw shale in the Fish 

 Creek section are thus described by Stone :^° 



The red and greenish sandstones overlying the Bearpaw shale con- 

 stitute a distinct lithologic unit, ranging in thickness from 200 to 460 

 feet, and although containing some shale members, are sufficiently 

 sandy and hard to form a conspicuous ridge. This formation is par- 

 ticularly well exposed as a ridge along the western side of T. 5 N., 

 R. 17 E., and crosses Fish Creek at the George Moore ranch. A mile 

 farther north it swings to the west and can be traced readily all the way 

 to Lennep. A peculiarity of this formation is its general reddish 

 color and the occurrence of a layer of red, sandy, cannonball nodules 

 near the middle. Its age has not been definitely determined, but 

 lithologically it belongs to the overlying formation and hence it will 

 be provisionally regarded as a part of the Laramie. 



The red color of this member has not impressed other observers. 

 To my eye the prevailing tints are grays and browns, but the topo- 

 graphic importance of the horizon has been recognized by all. The 



2»Bull. Am. Mus. Nat. Hist., Vol. XXIII, 1907, p. 832. 

 '" Op. cit., pp. 79, 80. 



