NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 355 



cation and that too great thickness had been given to the section 

 between the Tatei and the Lynx formations, but as I desired in the 

 short time available to secure fine photographs and collect more of the 

 fauna from Billings Butte and the base of Mumm Peak above Mural 

 Glacier, no detailed work on the section was undertaken, and the plan 

 to return to make a thorough study later was put aside as the work 

 in and north of Bow Valley absorbed all available time and funds. 

 Meantime, in 191 5 and 191 7, L. D. Burling made two trips to the 

 Robson District and found that I had duplicated parts of the section 

 by including the Hitka and Mumm formations. He inferred that 

 the two formations were based on the Mumm Peak section, which 

 was not the case, but he was undoubtedly correct in stating that they 

 do not occur there. A study of the photographs taken from the south- 

 east slope of Mumm Peak in 191 3 convinced me that I had not 

 allowed for the dip of the Tatei limestones into the north base of 

 Titkana Peak and that a portion of the Titkana formation had been 

 segregated as the Mumm formation. Burling went over the section 

 on another line where he found fossils and cleared the section up so 

 that the names Hitka and Mumm are now discarded. The names 

 Mural and Adolphus of Burling will probably follow Hitka and 

 Mumm into the discard when someone studies my section of the 

 Lower Cambrian, which Burling apparently did not do. 



Superjacent to the Tatei limestones, a thick series of bluish-gray 

 limestones in thick layers, that break down into thin layers, form 

 the northwest and west slopes of Titkana Peak (pi. 104). Traces of 

 fossils occur in many layers, and a well-marked Middle Cambrian 

 fauna was collected in the lower portion and also 1,000 feet (304.8 m.) 

 higher up. This series was partly measured and estimated, and 2,200 

 feet (670.6 m.) of it was segregated and later named the Titkana 

 formation. (Burling estimated the Titkana at 2,500 feet [762 m.] 

 in thickness). 



The five (now three) formations from the Lower Cambrian to 

 the top of the Titkana were placed in the Middle Cambrian. 



The views on plate 94 show clearly the line of the section of the 

 formations above mentioned from Moose Pass to the top of Tatei 

 Cliffs. 



The section above the Titkana was measured south to Snowbird 

 Pass (pi. 105), and then partly estimated southwest along the rock 

 exposures of the southwest side of " Phillips " Mountain (now 

 Chushina Ridge) (9,542 feet, 2,908.4 m.) (Wheeler, Lynx Center 

 Station) and the lower slopes of Lynx Mountain (10,471 feet, 



