SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 98, NUMBER 24 



THE PTARMIGANIA STRATA OF THE 



NORTHERN WASATCH 



MOUNTAINS 



(With 14 Plates) 



BY 





'O. 





CHARLES ELMER RESSER 



Curator, Division of Stratigraphic Paleontology 

 U. S. National Museum 



iBK^l 



(Publication 3550) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



OCTOBER 26, 1939 



