NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 353 



geological formations in the 13,300 feet (4,053.8 m.) of strata between 

 a great overthrust fault at Moose Pass and the summit of Robson 

 Peak. 



Beginning west of the Moose Pass fault above a few layers of the 

 basal quartzite, the siliceous shales and limestones on the northeast 

 slope of Tah Peak were examined and measured, and 800 feet 

 (243.8 m.) of beds were referred to a formation that was named Tah 

 when the section was prepared for publication. 



Above the Tah, on the northeastern and southwestern slope of 

 Tah Peak, a succession of quartzitic sandstones and grayish brown 

 shales that extend across a brook into the northeastern face of Mahto 

 Mountain' were measured, and a thickness of 1,800 feet (548.6 m.) 

 was segregated and later named Mahto sandstones. No fossils were 

 seen either in the Tah or Mahto on the line of the section. 



Superjacent to the Mahto on Mahto Mountain, a belt of massive- 

 bedded, arenaceous limestones was measured down the west-northwest 

 spur of the mountain to Coleman Brook (pi. 102). For 800 feet 

 (243.8 m.) of this series, the name Hota was proposed. On the west 

 slope of Mahto Mountain. Lower Cambrian fossils (Olcncllus cana- 

 densis Walcott) were found 500 feet (152.4 m.) from the base of the 

 Hota, and fragments were seen at several horizons. The three forma- 

 tions. Tah, Mahto, and Hota, were included in the Lower Cambrian, 

 with a total thickness of 3,400 feet (1,036.3 m.). 



On the southwestern side of Coleman Brook (pi. 102), above the 

 massive-bedded limestones of the Hota, bluish-gray, thin-bedded lime- 

 stones 900 feet (274.3 m.) thick were estimated and in part measured, 

 and the name Chetang was later applied to the formation. The 

 Albert cUa'' faunule was found 550 feet (167.6 m.) from the base. 



Above the Chetang a massive-bedded, gray, siliceous and arenaceous 

 limestone was estimated to be 800 feet (243.8 m.) thick; the name 

 Tatei was given to the formation. No fossils were seen." This carried 

 the section to the top of Chetang cliffs (pi. 102), from where it was 



' Smithsonian Misc. Coll., Vol. 57, No. 12, 1913, pi. 58, fig. i. 



^This is the first notice (Smithsonian Misc. Coll., Vol. 57, No. 12, 1913) of 

 the discovery of the true horizon of the Albertella faunule which I had ten- 

 tatively referred to the Lower Cambrian in 1908. Burling in 1915 found it in 

 position on Mount Bosworth (Summary Rep. Geo!. Surv. Canada for 1915 

 [1916], pp. 116-120). 



' Comminuted remains of trilobites occur in more or less abundance in many 

 of the limestones of the Middle and Upper Cambrian, but unless there was 

 some prospect of getting an identifiable species, no note was made of them. The 

 name Tatay as I used it in 1913 was subsequently changed to Tatei by the 

 Geographic Board of Canada. 



