CROSS-BEDDING IN WHITE RIVER FORMATION 55s 
high buttes and is overlain horizontally by the massive Arikaree (?) 
sandstone which, like the underlying strata, shows no signs of 
having been disturbed by either landslide or folding. 
That the cross-bedding so well exhibited in the Slim Buttes is 
not uncommon to the White River formation is indicated by the 
photograph (Fig. 5), taken on Shawnee Creek about nine miles 
west of Lost Spring, Wyoming. In that vicinity angles of inclina- 
tion of from 1-22° were observed by the writer on heavy beds of 
Fic. 5.—Cross-bedded sandstone in White River formation on Shawnee Creek, 
nine miles west of Lost Spring, Wyoming. 
sandstones and conglomerate of White River age,’ but no con- 
clusive evidence was found suggesting deformation since the White 
River beds were laid down. 
Until recently the rocks of the White River formation were 
supposed to have been deposited in a vast inland lake which covered 
portions of Colorado, Kansas, Wyoming, Nebraska, and the Da- 
kotas. As the result of detailed studies, however, it is now believed 
by many geologists that a portion of the rocks at least were deposited 
along the flood-plains of shifting streams and perhaps in part by 
t —D. E. Winchester, ‘‘The Lost Spring Coal Field, Converse County, Wyo.,”’ Bull. 
U.S. Geol. Survey, No. 471 (1912), p. 479. 
