BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 13, PP. 305-352, PLS. 46-53 NOVEMBER 15, 1902 



STRATIGRAPHY AND STRUCTURE, LEWIS AND LIVINGSTON 

 RANGES, MONTANA* 



BY BAILEY WILLIS 



{Presented before the Society January 1, 1902) 

 CONTENTS 



Page 



Synopsis , 300 



Introduction , 308 



Physical features 310 



Great plains 310 



Front ranges 310 



Lewis range 310 



Waterton-McDonald valley 312 



Livingston range 312 



Flathead valley , 313 



Stratigraphy 314 



General statement 314 



Algonkian 317 



Correlation 317 



Altyn limestone 321 



Appekunny argillite 322 



Grinnell argillite 322 



Siyeh limestone 323 



Sheppard quartzite 324 



Kintla argillite 324 



Carboniferous — Yakinikak limestone 324 



Triassic 325 



Cretaceous 326 



General note ■. 326 



Dakota 326 



Benton '. 326 



Laramie 327 



Tertiary lake beds of North Fork 327 



Pleistocene (?) —Kennedy gravels , 328 



Structure 330 



General statement 330 



Syncline of the Front ranges 330 



General features , , 330 



Details of local folds 330 



* Published by permission of the Director of the U. S. Geological Survey. 

 XLVI— Bur.T,. Geot,. Soc. Am., Vor,. 13, 1901 (305) 



