544 A. G. LEONARD 



The following is a general section of the White River beds as 

 they occur in White Butte: 



Feet Inches 



ii. Sandstone, rather fine-grained, light greenish gray in color, 



weathering into a greenish sand; to top of White Butte 105 



10. Clay, gray to light greenish color 20-25 



9. Clay, hard and compact, calcareous, light gray, almost white; 

 forms hard ledges which make low vertical cliffs toward the top 



of the butte, and weathers very irregularly 34 



8. Clay, dark gray, calcareous, the line of separation between this 

 clay and No. 7 is sharp and distinct, the clay being consider- 

 ably darker than the underlying sandstone 46 



7. Sandstone, light gray, rather coarse-grained 20 



6. Sandstone, very coarse-grained and pebbly; in places the peb- 

 bles are so abundant as to form a conglomerate. Shows cross- 

 lamination. Pebbles composed of quartz, silicified wood, 

 many varieties of igneous rock, among which porphyry is com- 

 mon. Pebbles range in size up to 2 and 3 inches in diameter ... 26 



5. Clay, very light gray, slightly sandy 5 



4. Sandstone, light gray, very fine-grained and argillaceous 5 4 



3. Clay, light gray to white, slightly darker than No. 2; contains 



some fine sand 10 6. 



2. Clay, very white and pure 6 6 



1. Clay, white, containing some fine sand, hard and very tough 



when dry; rests directly on the sandstone of the Fort Union. . 14 4 



Total 298 



In No. 8 of the above section was found the skull of an extinct 

 species of ruminant, Eporeodon major ( ?) , which is found in the 

 Oreodon beds of the Oligocene. 1 



It will be seen from the section just given that the White River 

 group is here composed of white clays at the bottom, on which 

 rests a coarse sandstone which in places is filled with large pebbles ; 

 this is overlain by about 100 feet of calcareous clays which in turn 

 are overlain by more than 100 feet of fine-grained, greenish sand- 

 stone (Fig. 13). 



These deposits represent all three divisions of the White River 

 group, the lower or Titanotherium beds, the middle or Oreodon 

 beds, and the upper or Protoceras beds. In the foregoing section 

 Nos. 1 to 7 probably belong to the lower, Nos. 8 to 10 to the middle, 

 and No. n to the upper division. 



1 Identified by Mr. J. W. Gidley. 



