740 L. D. BURLIXG CAMBRO-ORDOVICL^X ^'EAR MOUXT R0B50X 



name, is not overlain bv the massive limestones of the Mumm. but bv a 

 series of red shales indistinguishable from the basal Lynx (§ 2Tfe). For 

 these reasons we have not used the name Miimm in this paper. 



"HITKA FORMATIOX- (§27) 



(§ 27a.) The "Hitka formation" is described by AValcott as occurring 

 (a) between the Tatay cliffs and the Miimm limestones, on the westward 

 slope of the ridge east-northeast of the lower end of Lake Adolphus, and 

 (&) in Hitka Mountain. 



(§ 275.) Five formations were found by the writer in Mount Hitka — 

 a middle one underlain by two limestones referable to the Tatei and the 

 Chetang respectively (all fossiliferous) and overlain by red and yellow 

 shales referable to the Lynx. If the "Hitka'" is the upper red and yellow 

 shales, it is underlain by the Titkana instead of the Tatei: if it is the 

 middle formation, it is clearly identical with the Titkana. The fossils 

 amply corroborate this. 



TATEI LlilESTOyES (V2S) 



Mumm limestones (locality near lower end of Liike Adolphus) : Walcott, 

 Smithsonian Miscellaneous Collections, volume 57. number 12. 1913. page 

 330. 



Not Mumm limestones, given as typically exposed in upper part of Mumm 

 Peak: Walcott. idem, pages 334. 337 ( = Adolphus. §§30(7. 30&. 30^, and 

 32c). 



Mumm limestones, so far as position below Titkana limestones in general sec- 

 tion is concerned : Walcott, idem, pages 334, 337. 341. 



Mumm limestones, exposure at northwest base of Titkana Peak : Walcott. 

 idem, page 337. 



Not Mumm limestones, so far as description is concerned : Walcott, idem, 

 pages 334, 337, 341 (drawn from an outcrop of the '"Hota"). 



Tatay limestones, so far as position above the Chetang and occurrence in Tatei 

 cliffs is concerned : Walcott, idem, pages 334, 338, and 341. 



Mumm formation : Burling. Museum Bulletin number 2. Geological Survey of 

 Canada, 1914. page 109. 



Tatay formation : Burling, idem, page 109. 



Mumm formation : Walcott. Problems of American geology, 1915. page 179. 



Tatay formation : Walcott, idem, page 179. 



(§28a.) The Tatei limestones are described by Walcott as being 

 massive-bedded, gray, siliceous, and arenaceous, with an estimated thick- 

 ness of 800 feet and without fossils. 



(§ 28b.) As has been described in the discussion of the '"Hitka lime- 

 stones'' (§ 2T) and the ^*Mumm limestones*' (§ 26), this formation over- 

 lies the Chetang and underlies the Titkana instead of the "Hitka/"' both 



