268 



GEOLOGY. 



Pleistocene 



Bozeman series 



Sphinx conglom- 

 erate 



St 



Livingston series 



Laramie series 



Montana series 



Colorado series 



Dakota formation 



Ellis formation 



Quadrant forma- f 

 tion J. 



Madison limestone 



m 



Fig. 446. — Columnar 

 section showing the 

 succession of for- 

 mations in western 

 Montana. (Peale, 

 U. S. Geol. Surv.) 



