PRE-CAMBRIAX ROCKS OF THE BOW VALLEY — WALCOTT 429 



RisuME 



HECTOR FORMATION: 



Feet 



1. Dark-gray shale 520 



2. Greenish shale, with narrow bands of reddish purple shale. 120 



3. Purple shale 140 



4. Greenish shale 40 



5. Conglomerate 27 



6. Purple shale 455 



Total 1,302 



CORRAL CREEK FORMATION: 



1. Sandstone (estimated) 120 



2. Sandstones (estimated) 1,200 



Total 1,320 



Total section 2,622 



At the east base of Ptarmigan Peak, 2.5 miles north of the Fort 

 Mountain section, the Hector shales and conglomerate beneath the 

 basal conglomerate of the Cambrian are essentially the same as on 

 the south end of Fort Mountain, except that the green and purple 

 shales are closer to the Cambrian, owing to the thickness of dark 

 gray shale being less. Opposite the head of P>aker Lake the pre- 

 Cambrian shales and slibjacent compact, hard sandstones are thrust 

 over the Siluro-Devonian, arenaceous limestones. 



The relations of the basal conglomerate and the pre-Cambrian are 

 well shown north of Ptarmigan Peak ; also at the north foot of Fort 

 Mountain. 



On the northeast ridge of Mount Temple and northwest of the 

 Valley of the Ten Peaks the downward section is as follows: 



CAMBRIAN CONGLOMERATE 

 Unconformity 



ALGONKIAN 



HECTOR FORMATION: Feet 



1. Hard, steel gray, siliceous shales in thin lamellae, with inter- 



bedded siliceous layers, varying from thin shale to an inch 



in thickness I45 



2. Flaggy, compact, finely arenaceous beds 480 



3. Greenish, compact, slaty, siliceous shales, with a few thin layers 



of hard dove-colored to pinkish limestone. [This is about 

 the same horizon as the interformational conglomerate in No. 

 2, of the Fort Mountain section.] 255 



