STRATIGRAPHIC SUMMARY. 6i i 



Lower Cambric. 



4. Mt. Whyte formation 390 ft. 



3. St. Piran formation 2,705 ft. 



2. Lake Louise formation 105 ft. 



I. Fairview formation 1,000 ft. 



Base not known. 



Canadiah geologists have grouped formations i to 3 inclusive as 

 the Bow River Group and the remainder, together with some of 

 the basal Ordovicic, as the Castle Mountain Group. 



The section in northeastern Utah and southern Idaho includes : 



SUPERFORMATION. 



Lower Ordovicic (Upper St. Charles). 

 Upper Cambric. 



St. Charles formation 1,227 ft. 



Middle Cambric. 



Nounan formation 1,041 ft. 



Bloomington formation 1,320 ft. 



Blacksmith formation 570 ft. 



Ute formation 729 ft. 



Spence shale 30 ft. 



Langston formation 498 ft. 



Brigham formation 1,232 ft. 



Base not exposed. 



In the House Range, Utah, the following section occurs : 



Superformation. 



Lower Ordovicic (Upper Notch Peak). 

 Upper Cambric. 



Notch Peak formation 1,490 ft. 



Orr formation 1,825 ft. 



Middle Cambric. 



Weeks formation i,390 ft. 



Marjum formation 1,102 ft. 



Wheeler formation 570 ft. 



Swasey formation 340 ft. 



