GEOLOGIC FORMATIONS 745 



of 800 feet, uiifossiliferous, and resting on a few layers of McNaughton 

 sandstones before the whole section is cut off by a fault which brings 

 down the Upper Cambrian. 



(§326.) This formation is the one which Walcott found occurring 

 Just above the ^'new Lower Cambrian .subfauna" in the moraine of the 

 Mural Glacier and identified as "Hota" (§§ 30 and 31). This threw out 

 the whole Mumm Peak section and resulted in the identification of the 

 thin-bedded quartzites of the Mahto as the Chetang and the description 

 of the real "Hota" (now called Adolphus), which stands out clear and 

 distinct as a cliff above, for a new and much higher limestone, to which 

 the name Mumm was given. 



(§ 32c.) It should be recorded that when I reached the summit of 

 Mount Hitka, approaching it from the valley of Smoky Eiver, I did not 

 know that the faulting between Mount Hitka and ]\Iumm Peak was as 

 large as it is, and I had not the slightest doubt that I was viewing the 

 section described by Walcott — Mumm, Hitka, Tatei, Chetang, and Hota, 

 listing them from the top down. I was the most surprised of individuals 

 when I started up the north face of Mumm Peak, and, after passing 

 through Walcott's "Hota," with its profusion of Olenellus (the "^new 

 Lower Cambrian subfauna"), reached a quartzitic series more than a 

 thousand feet in thickness, instead of the Middle Cambrian Chetang 

 limestones. It was not until I reached the summit of Mumm Peak from 

 the south side that I could realize (a) that the limestone to which Wal- 

 cott had applied the name "Mumm" was really the "Hota,'* and (b) that 

 the Mural Glacier fossils (the "new Lower Cambrian sub fauna'') came 

 not from the "Hota," but from a horizon approximately 1,750 feet below. 



(§ 32d.) I first drew the line between the "Tah" and the Mahto below 

 bed number 8 of the north face section, and in my description of 

 Pcedeumias rodsonensis'^^ I referred this form to the Mahto. This coin- 

 cided with Walcott's reference of the "new Lower Cambrian subfauna," 

 of which Pcedeumias rohsonensis is a member, to the Mahto. -^ I thus 

 ignored the fact that the same fauna had been referred three days later-^ 

 to the "Hota," and accepted its re-reference to the Mahto three years 

 later.=^^ 



This reference of Pcedeumias rohsonensis, and therefore of the new 

 subfauna, to the Mahto was, however, questioned by Mr. Eesser, of the 

 United States National Museum, in a personal communication : 



-« Ottawa Nat, vol. 80. 1916, p. 55. 



"Smithsonian Misc. Coll., vol. 57, no. 11, 1913 (July 21), pp. 309-326. 



28 Idem, no. 12, 1913 (July 24), pp. 338, 339. 



29 Ann. Kept. Smithsonian Inst, for 1915, pi. 17, p. 254, 1916. 



XLIX — Bull. Geol. Soc. Am., Vol. 34. 1922 



