284 



Annals of the Carnegie Museum. 



Lower White 

 River. 



light gray, the darker of a bluish tint. These 

 laminae alternate irregularly on the weathered 

 surface ; they also unconformably overlie the 

 brownish sand beneath. At the bottom of a 

 trough-like depression there are two or three 

 thin bands of iron-stained material about yg 

 inch in thickness. In tracing the deposit up- 

 ward it was sometimes seen to be laminated 

 and sometimes massive. Part of it is a gray 

 sandstone, and the structure makes it appear as 

 as if part of the mass had been deposited in an 

 uneven surface of the other portion. Scattered 

 over the surface of the darker gray portion are 

 fragments of petrified wood, rounded pebbles 

 of white quartz, granite, granitic rock without 

 mica, gray, bluish-gray, brown, and reddish 

 quartzite of compact texture, and gray, brown, 

 reddish, purplish, and bluish cellular pebbles, 

 some of which look like volcanic material, but 

 are mostly granular rock, some of the crystals 

 of which have been dissolved. These frag- 

 ments vary in size from that of fine sand to large 

 pebbles, some of which are six inches in diam- 

 eter. There are also flat, flinty fragments, 



which contain impressions of plants 35 ft. 



I. Lowest exposure found at this place. A brown- 

 ish iron-stained homogeneous sand with small, 

 brown, concretionary masses. Upper surface 

 not level, but having depressions filled with 



No. 2 5 ft. + 



Total thickness of section 2IO ft. 



Another section from another locality on White Butte partly supple- 

 ments the one just given, as it extends upward through the Upper 

 White River beds. Its lowest member corresponds with No. 5 of the 

 preceding section, beginning with the top of the Titanotherium beds 

 and extending upward through the Oreodon and overlying beds as 

 high as they are exposed at White Butte. 



Section of Upper Portion of Western Ridge of White Butte. 



(From above downward.) 

 ' 13. Green sand, mostly unconsolidated, gray sand, 



shale, and fragments of bones 18 ft. 



12. Green sand. Fragments of bones of Rhinoceroses, 



etc 8 ft. 



II. Green sandstone, unequally hardened, so that it 



