CROSS-BEDDING IN WHITE RIVER FORMATION 553 
1. In the area between Old L Ranch and Flat Top Butte, about 
seven miles to the southeast, several flat-lying lignite beds are 
exposed, the outcrop of one (see Fig. 1) having been followed and 
prospected for a distance of several miles. 
2. Between Reva Gap and Old L Ranch, numerous exposures 
show not only clay and sandstone beds of the White River formation 
but also the underlying lignite-bearing rocks to occupy a practically 
horizontal position. Ship Rock (Fig. 3), about 2,000 feet east of the 
point of which Fig. 1 is a photograph, exhibits White River beds 
Fic. 3.—Ship Rock 
in a horizontal position below the characteristic sandstone. (Photo- 
graphs shown in Figs. 2 and 3 are taken looking in a southwest 
direction.) Hence the inclined beds cannot belong to a single 
anticlinal structure. 
In the study of the lignite beds along the eastern margin of 
the Slim Buttes, still more convincing evidence was found to dis- 
prove the idea that the rocks of the region even in restricted areas 
were folded and faulted at the close of White River time. As 
is shown on the map (Fig. 1), a bed of lignite outcrops for several 
miles along the eastern side of the Slim Buttes in the vicinity of 
Old L Ranch. This bed occurs only a few feet below the White 
River formation and its outcrop is well exposed in sec. 32 near 
the point at which the photograph (Fig. 4) was taken. However, 
