BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 15, PP. 379-448, PLS. 23-36 AUGUST 22, 1904 



COMPARISON OF THE STRATIGRAPHY OF THE BLACK 



HILLS, BIGHORN MOUNTAINS, AND ROCKY 



MOUNTAIN FRONT RANGE * 



BY N. H. DARTON 



(Presented before the Society December 28, 1903) 

 CONTENTS 



Page 



Introduction 381 



Black Hills region 382 



List of the formations 382 



Dead wood formation 382 



Whitewood limestone 382 



Englewood limestone. 384 



Pahasapa limestone 384 



Minnelusa formation .... 384 



Opeche formation 385 



Minnekahta limestone 386 



Spearfish formation -. 386 



Sundance formation 387 



Unkpapa sandstone 388 



Morrison shales 388 



Lakota sandstone 389 



Minnewaste limestone 389 



Fuson formation 389 



Dakota sandstone 390 



Graneros formation , 391 



Greenhorn limestone 391 



Carlile formation. 392 



Niobrara formation 392 



Pierre shale 392 



Fox Hills and Laramie formations 393 



Bighorn mountains 394 



General characteristics of the section and list of formations 394 



Dead wood formation 39 5 



Bighorn limestone 395 



Littlehorn limestone 396 



Amsden formation 396 



♦Presented by permission of the Director of the United States Geological Survey. 

 LII— Bum.. Geot,. Soc. Am., Vol. 15, 1903 (379) 



