446 



ARTHUR BEVAN 



I 



Fig. 3. — The plains-ward front of the Beartooth Range west of West Rosebud 

 Creek. The elevation at the base is about 6,000 feet and at the summit about 10,000 

 feet. The even crest marks the rim of the sub-summit plateau, which is notched by- 

 cirques. 



Fig. 4. — A portion of the sub-summit plateau showing its remarkable flatness 

 over large areas. The altitude is about 10,000 feet. The rocks are pre-Cambrian 

 crystallines. Silver Run Plateau, southwest of Red Lodge, in the foreground, with 

 Line Creek Plateau to the south beyond Rock Creek. 



