PRE-CAMBRIAN ROCKS OF THE) BOW VALI<e;Y — WALCOTT 43 1 



is a large and interesting field for exploration in this region and 

 north to the knov/n Cambrian rocks of the Kicking Horse-Bow 

 Valley section. With the data now available there should be little 

 difficulty in mapping the pre-Cambrian, Cambrian, and post-Cam- 

 brian rocks. 



With our present information the Hector and Corral Creek forma- 

 tions may be correlated in stratigraphic position with the Camp 

 Creek and Kintla-Sheppard series of the Montana Algonkian, which 

 are above the great Siyeh limestone.^ The Bow Valley section does 

 not extend down to the horizon of any massive pre-Cambrian lime- 

 stone, but the fragments of limestone in the conglomerates of the 

 Hector formation indicate the presence of subjacent limestones that 

 were so situated as to be eroded by streams or shore waves when the 

 sediments of the Hector formation were being deposited. 



RESUME 



The object of this brief paper is to call attention to the presence 

 in the Bow Valley, Alberta, of unaltered sedimentary strata of pre- 

 Cambrian age. They lie unconformably beneath the Cambrian and 

 are non-fossiliferous, as far as known. The formation names Hec- 

 tor and Corral Creek are proposed for them, and they are correlated 

 with the Camp Creek and Kintla-Sheppard series of arenaceous 

 rocks which lie beneath the Cambrian and above the Siyeh limestone 

 in Montana, southwestern Alberta, and southeastern British Co- 

 lumbia. 



*Bull. Geol. Soc. America, vol. 17, 1906, p. 18. 



