U. S. GEOLOGICAL SURVEY 



BULLETIN NO. 361 PL. Ill 



IDEALIZED BIRD'S-EYE VIEW OF THE GREAT BADLANDS OF SOUTH DAKOTA, SHOWING 

 CHANNEL AND OVERFLOW DEPOSITS IN THE OLIGOCENE AND LOWER MIOCENE. 



Looking southeast across Cheyenne and White riversto Porcupine Butte, on Porcupine Creek, Pine Ridge Reser- 

 vation. The location of the panorama is shown in PI. II, approximately on the line of section B. The ancient 

 river-channel deposits in the successive levels are +he " Tif<t7i()flirriui» sandstones," " M(tam]in<)<iov sand- 

 stones," and " PmtoreraK sandstones." River-channel conglomerates appear in the Rosebud levels also. 



