﻿NO. 2 



SMITHSONIAN EXPLORATIONS, 1 924 



II 



from Wisconsin, and the fauna of the upper band was found to be 

 of the same type as the fauna of the St. Lawrence member of the 

 Trempealeau formation of Wisconsin. With these two faunules 

 definitely located in the upper portion of the Lyell limestones, we now 

 know that the latter are of Upper Cambrian age, and thus is brought 

 to a successful conclusion a search conducted for four field seasons 



Fig. i6. — Diagrammatic section of the Upper Lyell at Tilted Mountain Falls 

 (see fig. 8). 1* = Arenaceous beds at contact of Lyell and Mons formations; 

 I^ I**, i'-', gray magnesian limestones; i", i*", i"", fossiliferous bands of shale 

 and gray limestone. (C. D. Walcott, 1924.) 



Mountain 



De'^o n la n 



Bosworih 



Lyell 



Baker CreeTi^ 

 Canyon Val ley 



Mons 



Fig. 17. — Diagrammatic section of Tilted Mountain interpreting the geologic 

 structure, as shown by fig. 7. (C. D. Walcott, 1924.) 



to determine the position of Lyell limestones in the Upper Cam- 

 brian series of the Canadian Rockies. 



With the Lyell question out of the way, further collections were 

 made from the Ozarkian upper Mons limestones of Fossil Mountain 

 before going to Wild Flower Canyon. The latter is referred to in 

 the account of exploration in 1921.^ It heads on Johnston Creek Pass 

 and extends in a northwesterly direction to where it joins Baker 

 Creek Canyon. The gray limestones of the Mons formations form 

 the high ridge on its northeast side and in these were collected many 



^ Smithsonian Misc. Coll., Vol. 72, No. 15, 1922, pp. 8, 9. 



