NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 235 



With the discovery of typical Mons fossils west of the Kootenay fault 

 and typical Upper Cambrian fossils at Wapta Falls in the limestones 

 east of the fault, the distinction between the Goodsir and Mons is 

 conclusive. 



Organic remains. — Through the courtesy of the Director of the 

 Geological Survey of Canada, I had the opportunity of studying the 

 first collection of fossils made by Dr. Allan, and reported on them 

 in 1912.* The material was not well preserved, but one species of 

 trilobite appeared to belong to the genus Ceratopyge, and I correlated 

 the fauna with that of the Ceratopyge zone of northwestern Europe, 

 saying : 



The broad question of the Cambro-Ordovician boundary in other sections 

 of North America is one that is still in process of adjustment owing to the 

 absence of detailed information as to the boundaries between formations and 

 the character of the faunas in the formations. 



In the monograph of the Cambrian Brachiopods (Monogr. U. S. Geol. Surv., 

 Vol. 51, 1912), now in press, several formations have been included in the 

 Cambrian or in " passage beds " between the Cambrian and Ordovician that 

 will ultimately be classified with the Ordovician, or, as in the case of the 

 Missouri section (Ulrich, Bull. Geol. Soc. America, 1911, Vol. 22, pi. 27) of 

 the Mississippi region placed in a terrane between the Cambrian and Ordovician.' 



This led Dr. Allan to refer the Goodsir to the Ordovician in his 

 final report of 1914.' 



L. D. Burling, collecting for the Geological Survey of Canada, 

 found a number of fossils in the lower 300 feet (91.4 m.) of the 

 Goodsir, among which are several species not in the Allan collection 

 that, taken with those first found by Allan, fully establish the fauna 

 as of Upper Cambrian age. 



The fauna is designated as the Housia fauna and includes species 

 of O bolus, Lingulella and Pseudagnostiis.* 



Observations. — Since Allan's work appeared in 191 4, three dis- 

 coveries related to it have been made : 



1. The Goodsir fauna has proved to be of Upper Cambrian and 

 not Ordovician age. 



2. I have identified an Ozarkian formation (Mons) 3.300 feet 

 (1,005.84 m.) in thickness in the Beaverfoot-Brisco-Stanford Range, 

 as of post-Cambrian and pre-Ordovician age. This formation has 



^ Smithsonian Misc. Coll., Vol. 57, No. 7, 1912, pp. 229-234, pi. 35. 



^ Idem, p. 231. 



^ Geol. Surv. Canada, Mem. No. 55, 1914, p. 99. 



■"As stated in the note on p. 200, subsequent study of this fauna and com- 

 parisons with others collected in the Black Hills and elsewhere, indicates the 

 possibility that these fossils belong well down in the Upper Cambrian. — C. E. R. 



