22 L. D. BURLIXl. CAMBRO-ORDOVK IAN NEAR MOUXT ROBSOX 





Page 



Adolphiis ) "Hora" i limestone 741 



Mahto sandstones 743 



Mural ( "Tali" i limestone formation 744 



MeXangbton sandstones 74(] 



Miette sandstones 747 



IXTBODUCTTOX (^ 1) 



McEvoy- was the first geologist to describe the succession near Yellow- 

 head Pass, between British Columbia and Alberta, on the line of the 

 Grand Trunk Pacific Eailway. He applied McConnell's^ terms, Bow 

 Eiver and Castle Momitain, to the clastic lower and the calcareous upper 

 portions respectively, mapping Mount Robson itself as Castle Mountain. 



Walcott has published two papers on the geology.^ These papers are 

 extensively referred to in the following pages, but this is the proper place 

 to record my regret at having to present an interpretation of the stratig- 

 raphy so widely different from that of ^Ir. Walcott. It is unfortunate 

 that conclusions so diverse from those that have preceded them should 

 be based on field work so incidental as my own. and I should hesitate to 

 present the results of a few days" reconnaissance in an area where another 

 has done several seasons* work if my evidence were not extensive. 



The differences bet^veen the two interprtatious of the sections involve 

 so many points that the general reader who pays too close attention to 

 the descriptions of formations or individual mountains may become con- 

 fused. For such there is presented a generalized section giving Walcott's 

 interpretation and my o\m (§2). and three tabular correlation tables: 

 the nomenclature and thickness of the formations (§3): the included 

 fossils and the age relationships of the formations (§ J:) : and the nomen- 

 clature of the mountains and the rocks exposed in each formation (§ 5). 



The paper throws new light on the stratigraphy and paleontology of 

 a most interesting section of the lowermost Paleozoic, and its details are 

 essential to the future worker who may wish to use the area as a key for 

 exploratory work in the neighboring regions, because some of the forma- 

 tions, stated by AValcott to be t^'pically exposed in certain mountains, are 

 entirely absent from them (Mounts Alumni and Rearguard, for exam- 



2 Ann. Kept. Geol. Surv. Canada for 1S9S. vol. xi. 1901, Part D. 



3 Idem for 1S86. Part D. ISST. pp. 29D-30D. 



* New Lower Cambrian subfauna : Smithsonian Misc. Coll.. vol. -37, no. 11. 1013. pp. 

 309-326, pis. 50-54 (published July 21 1. 



Cambrian formations of the Robson Peak district. British Columbia and Alberta. 

 Canada. Idem. vol. 57, no. 12. 1013, pp. 327-343, pis. 5.5-50 (published .July 24). 



