NO. 5 I'RE-DEVONIAN PALEOZOIC FORMATIONS 257 



Geographic distribution. — The Bow River Valley from west of 

 Hector Lake nearly to Banff Station, a distance in direct line of about 

 45 miles (72.4 km.) is underlain by the Hector and Corral Creek 

 formations. Northwest of Laggan (now Lake Louise Station) they 

 extend up the Pipestone River nearly to the Little Pipestone and 

 eastward entirely around the group of mountains of which Ptarmigan 

 Peak is the highest point. Opposite Castle Mountain the exposures 

 continue up Little Vermilion Creek, over 5 miles (8 km.). 



Fauna. — None known. 



Observations. — The upper part of the Hector is essentially the 

 same at the east base of Ptarmigan Peak as at the south end of Re- 

 doubt Mountain, except that the dark gray shales are thinner, which 

 brings the purple shales nearer to the Lower Cambrian. A little north 

 of the head of Baker Lake, the shales of the Hector have been thrust 

 eastward over the westward sloping Upper Devonian limestones (see 

 pi. 45). There is a large exposure of the shales, and the contact of the 

 basal bed of the Lower Cambrian with the Hector is finely shown. 



Corral Creek Formation. Walcott, 1910^ 



Type locality. — Corral Creek northeast of Laggan (now Lake 

 Louise Station). 



Derivation' — From Corral Creek, 



Character. — Coarse-grained, light-gray sandstones, with a few thick 

 layers of fine quartz conglomerate, 120 feet (36.6 m.). Hard quartzi- 

 tic sandstones that usually break up on exposure to weather. They 

 are im])ure, and the quartz grains are a dead milky white, or glassy 

 and stained. 



Thickness. — Estimated on the hills adjoining Corral Creek 1,320-1- 

 feet (402.3+ m.) down to an anticline and greatly disturbed strata. 



Geographic distribution. — Approximately the same as the Hector 

 shales but more within the limits of the Bow River Valley. 



Fauna. — None known. 



Observations. — In northern Montana and a little north of the Inter- 

 national Boundary a distance of from 140 to 175 miles (225.3 to 

 281.6 km.) south-southeast from the Bow River Valley, the Algonkian 

 Camp Creek and Kintla-Shephard series of arenaceous shales and 

 sandstones appear to have about the same stratigraphic position as 

 the Hector-Corral Creek strata. They overlie the great Siyeh lime- 

 stone which is not exposed in the Bow River Valley area but may 

 underlie the valley as fragments of limestone occur in the Hector 

 conglomerate. The Siyeh should be below the Corral Creek sand- 

 stones, if the two sections are at all similar. 



* Loc cit. 



