SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 69, NUMBER 4 



EARLY MESOZOIC PHYSIOGRAPHY OF 

 THE SOUTHERN ROCKY MOUNTAINS 



(With 4 Plates) 



BY 

 WILLIS T. LEE, PH. D., GEOLOGIST, 



United States Geological Survey 



(Publication 2497) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JULY, 1918 



