walcott.1 NEWFOUNDLAND. 55 



North America 1 when discussing- the strati graphic position of the Ole- 

 nellus fauna. In it lie says 2 that the only locality known where the two 

 faunas occur in the same geographic area is on Conception Bay, New- 

 foundland ; and special stress is placed on the occurrence at Topsail 

 Head of several species of fossils typical of the Olenellus zone at the 

 Straits of Belle Isle. This fauna was referred to the Middle Cambrian, 3 

 although Dr. Murray states in his section of 1868 that Mr. Billings re- 

 ferred the species to the Potsdam. 4 By this Mr. Billings probably 

 meant his lower Potsdam, which is now (1890) included in the Lower 

 Cambrian. 



„ In an abstract of a paper on the Cambrian faunas of Cape Breton 

 and Newfoundland, published in advance of the paper read before the 

 Eoyal Society of Canada, Mr. G-. F. Matthew 5 classifies the horizons of 

 the Cambrian as follows : 



(1) The horizon of Paradoxides kjerulfi, 



(2) The horizon of the Conocoryphees. 



(3) The horizon of Paradoxides tessini. 



(4) The horizon of Paradoxides spinosus. 



(5) The horizon of Paradoxides davidis. 



It is stated 6 that "in this classification of the various Newfoundland 

 horizons in the Paradoxides zone Mr. Matthew has placed that of Para- 

 doxides lijerulfl first or oldest, because that is its position in Scandi- 

 navia." In the final paper 7 he speaks of the fossils found at Topsail 

 Head, and Brigus on Conception Bay, mentioning Agraulos strenuus, 

 Iphidea (allied to Iphidea bella Billings), and Stenotheca paupera Bil- 

 lings. He says these fossils do not give sufficiently firm indications to 

 make it clear that they are older than some other horizons mentioned 

 hereafter. He then describes the fossils of the Paradoxides zone. A 

 new species, SolenopJeura bombifrons, is described from the limestone of 

 Topsail Head. 8 



In the summer of 1888 Mr. C. D. Walcott made a careful study of the 

 Cambrian section in Newfoundland, and determined the Olenellus zone 

 to be beneath the Paradoxides zone, and not above it, as arranged by 

 Logan in his scheme of 1864. A detailed section of the Cambrian 

 strata on Conception Bay was published, with lists of the fossils 

 occurring at the different horizons in it. 9 



Second contribution to the studies on the Cambrian faunas of North America. U. S. Geol. Surv., 

 Bull. No. 30, vol. 4, 1886. 



2 Op. cit, p. 49. 



3 Op. cit,, p. 29. 



4 Of the sequence and distribution of the formations. Report upon the geological survey of New- 

 foundland for 1868. Rovised edition, 1881, " P. 1 " of section, p. 157. 



B The Cambrian faunas of Capo Breton and Newfoundland (abstract). Can. Record Sci., vol. 2, 1886, 

 pp. 255-258. 



6 Op. cit, p. 258. 



7 On the Cambrian faunas of Cape Breton and Newfoundland. Royal Soc. Canada, Proc. and Trans., 

 vol.4, section iv, 1887, pp. 147-157. 



8 Op. cit., p. 156. 



"The stratigraphical succession of the Cambrian faunas of North America. Nature, vol.38, 1888, 

 p. 551. Stratigraphic position of the Olenellus fauna in North America and Europe. Am. Jour. 

 Sci., id ser., vol. 37, 1889, pp. 374-392 ; vol. 38, 1889, pp. 29-42. 



