504 Dr. H. Woodward — M. Cambrian Fossils of the Rockies . 



Tbilobita. , Agnostus inter sir ictus. 



Neolenus serratus {Ogygia Agnostus, sp. 



serrata). _ 



Olenoides Nevadensis. Phtllocarida. 



Olenoides, sp, Anomalocaris Canadensis 

 Ptycoparia Cordillerce. (Whiteaves). 



Ptycoparia, sp. 



BatJiyurus Dawsoni. Brachiopoda, 



Bathyurisciis Sowelli (Embolimus Obolella, sp. 



rotundata). Acrotreta gemma. 



Ogygopsis Klotzi. Kutorgina pannula. 



Ogygopsis, sp. Lingulella ella. 



Zacanthoides spinosus. Scenella, sp. 

 Oryctocephalus Bey noldsi {GowT^er HyolitJies, sp. 



Eeed). Theca, sp. 



Dr. Ami, in reply to my queries, says: — "I do not know of any 

 greater elevation than that of Mount Stephen from which Trilobites 

 have been obtained, unless the Pioohe Nevada or the localities in 

 Utah (where the same fauna also occurs) attain to a greater elevation. 

 It would be interesting to compare the heights of Canadian with 

 United States localities." 



Certainly the Mount Stephen Trilobite beds are the MgJiest point 

 in the Rocky Mountains where Trilobites have been found. 



It is a generally accepted axiom in geology that the oldest 

 mountains in the world are now the least in point of altitude, 

 having been subjected for such vast periods of geological time to 

 subaerial denudation that we now only contemplate their degraded 

 remains ; the strata composing them being also, as a rule, highly 

 metamorphosed and crumpled. 



Here, however, we are presented with mountains composed of 

 Cambrian strata — the oldest stratified rocks we know containing 

 living organisms — having an elevation of some 6,000 feet above 

 the pass, or 10,000 feet above sea-level, rich in well-preserved 

 Trilobites, but little distorted, the strata lying in horizontal sequence, 

 and in almost the same undisturbed condition as on the day, millions 

 of years ago, when these deposits were laid down in the depths of 

 the primordial ocean. 



Mr. C. D. Walcott places the Trilobite shales of Mount Stephen 

 in the Middle Cambrian series; but Dr. G. F. Matthew considers 

 them to be Upper Cambrian in age. A careful examination of the 

 2,500 feet of basal shales, limestones, and sandstones upon which 

 the Trilobite-bearing beds rest, is essential, as, if Dr. Matthew's 

 contention is correct, they should represent the Middle and Lower 

 Cambrian. Similarly, the 2,000 feet of overlying limestones, forming 

 the summit of Mount Stephen, ought in that case to yield Silurian 

 fiossils to the enterprising climber who should scale their precipitous 

 cliffs. 



At least a dozen genera of fossils have rewarded Mr. Whymper's 

 researches, and in a newly explored valley named ' Ball's Valley ' 



