NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 337 



Feet Meters 

 2b. Massive-bedded, light gray limestone, breaking down 

 into layers i to 4 in. (2.5 to 10 cm.) thick and be- 

 coming granular on weathering 260 79.2 



This belt with the one below occurs as a high, bold 

 northward- facing cliff and unites with the belt above 

 2a to form a great cliff 600 feet (182.4 m.) or more 

 in height. Usually a shelf or terrace separates 2a 

 and 2b. 

 2c. Gray, rough dolomitic limestone, weathering on long 



exposure to a dark, reddish-brown, rusty color 36 ii.o 



2d. Massive layers of gray, rough-weathering limestone, 



breaking down into thin, irregular layers near base. . . 74 22.6 



Total thickness of Cathedral formation 1,240 378.0 



It is quite possible that 2b, 2c, and 2d represent the 

 upper part of the Ptarmigan formation, but of this no 

 evidence was obtained in the cliff exposures. 



Ptarmigan Formation 



10. Thin-bedded, gray limestone, with some shale and bands 



of oolitic layers 306 " 93.3 



Fauna. — (65 o) : 



Albert ella sp. 



LOWER CAMBRIAN 

 Mount Whyte Formation 



la. Greenish-gray calcareous shale, with a few thin layers 



of hard, dove-colored limestone 124 37.8 



lb. Lead-gray oolitic limestone in layers 3 to 12 inches 



(7-6 to 30.4 cm.) thick 16 4.9 



Total thickness of Mount Whyte formation 140 42.7 



Fauna. — (65n) : 



Hyolithes 

 Scenella sp. 

 Olenellus cf. thompsoni 

 Bonnia sp. 



St. Piran Formation 



la. Light gray quartzitic sandstone in layers 6 to 30 inches 



(15.2 to 76 cm.) in thickness 380 115.8 



I fe. Alternating bands of thin-bedded quartzitic sandstone 



and siliceous shale 90 27.4 



I c. Massive-bedded, light gray quartzitic sandstone with 



band of arenaceous shale about 250 feet (76 m.) from 



summit 300 91 .4 



Total exposure 770 234.6 



Talus slope to Siffleur River flats. 



