724 



L. D. BURLIN( 



-CAMBRO-ORDOVICIAN NEAR MOUNT ROBSON 



Middle Cambrian : 



Titkana limestones (§25)... 



Massive beds of tMn layers 



of bluish gray limestone 



with bands of dolomitic 



limestone. 



Thickness in Mounts Tit- 

 kana and Rearguard 

 (§25a). 



Fossils : An upper horizon 

 comparable with the Ste- 

 phen and a lower hori- 

 zon 1,000 feet below 

 (§2oa). 



Feet 



2,200 



Minmu limestones (§ 26) .... 

 Massive-bedded gray are- 

 naceous limestone. 



Thickness estimated from 

 an exposure of the 

 "Hota" in Mumm Peak 

 (§§26&, 30&). 



Fossils : None. 



600 



Hitka formation (§27) 1,700 



Alternating bands of thin 

 layers of arenaceous lime- 

 stones and shales. 

 Thickness estimated from 

 an exposure of the Tit- 

 kana in Mount Hitka 

 (§27&). 

 Fossils : None. 



Middle Cambrian : 



Titkana limestones (§ 25) . . . 

 More or less thin-bedded 

 usually dark-colored lime- 

 stones with bands of shale 

 and beds of dolomitic 

 limestone. 

 Thickness in Titkana Peak 

 (§§18, 2M, 25»). 



Fossils : Abundant and in 

 a score or more of hori- 

 zons, including the upper 

 one of Walcott, which oc- 

 curs 600 feet above the 

 base of the formation, 

 and the low^er one, which 

 occurs at the base of the 

 formation ( § 25fl ) . 



Not present in the section. 

 The formation was de- 

 scribed from an exposure 

 of the "Hota" (§§ 30?>, 

 30^, 32c), but was as- 

 signed to a position in 

 the section which made 

 it and the Tatei synony- 

 mous. The latter name 

 has been accepted for 

 the formation (§28&). 



Not present in the section. 

 The Hitka and the Tit- 

 kana are synonymous 

 and the latter term has 

 been accepted (§25?>). 



Tataij limestones (§28) 

 Massive-bedded gray 

 naceous limestone. 



are- 



800 



Thickness obtained in Tatei 

 clife. 



Fossils : None. 



Feet 



2,550 



Tatei limestones (§28) 1,000 



More or less massive blue 

 to blue gray limestones, 

 1,000 feet being exposed 

 beneath Titkana above 

 Lake Adolphus and 900 

 feet in Tatei clife, but 

 upper and lower bound- 

 aries uncertain, because 

 Walcott's description is 

 general and does not re- 

 cord fossils. 

 Fossils : Frequent, several 

 lots being secured, but 

 less fossiliferous than 

 underlying Chetang or 

 overlying Titkana. 



