64 THE CAMBRIAN. I bull. 81. 



list of the species described by Mr. Billings from the Paradoxides zone 

 and the strata of Great Bell Island. 



Prof. John Milne traveled extensively along the coast of Newfound- 

 land, and published the results of his geologic studies in association 

 with the u Notes on Geology " by Alexander Murray. 1 The Primordial- 

 Silurian is spoken of as a separate division; then, superjacent to the 

 rocks of this formation, come the Potsdam and Oalciferous. There 

 does not appear to be any additional data to that already given in the 

 report on the geology of Newfoundland by Dr. Murray. 



When describing some fossils collected by Mr. T. C. Weston, of the 

 Canadian Geological Survey, in 1874, from St. Mary's, Trinity, and Con- 

 ception Bays, Newfoundland, Prof. J. F. Whiteaves states that the 

 paleontological evidence sustains the view of Sir W. E. Logan that the 

 slates of St. John's, Newfoundland, probably belong to the same horizon 

 as the Acadian or St. John group of St. John, New Brunswick. 2 Of 

 the deposits on the islands of Conception Bay he says: "From Mr. 

 Murray's report already quoted it would appear that the shales of Kel- 

 ly's Island are not quite so old as those of Manuel's Brook, but that 

 they are older than the Menevian sandstones of Great Bell Island." 3 



Dr. Murray appears to have considered the Potsdam zone as above 

 the Primordial beds of Newfoundland. This is shown in the chapter 

 on the " Geology of Newfoundland," where a summary of the geology 

 is presented as taken from Dr. Murray's work. 4 



Prof. Alpheus Hyatt, in his expedition to Newfoundland, visited the 

 north coast of the Straits of Belle Isle, and collections were made at 

 Anse au Loup and Amour Cove from the "so-called Potsdam sandstones 

 and limestones of the Canadian survey. The observations made at these 

 points indicate a fauna quite distinct from those of any of the limestones 

 or slates of the west coast of Newfoundland. The absence of Cepha- 

 lopoda and the prevalence of primitive forms of Archreocyathus show 

 the rocks to be probably older than those of the Quebec group at Port 

 au Choix and other localities. The primitive sponges, or ArchaBOcyathi, 

 have here replaced corals completely, and may be described as reef- 

 builders, since numerous hummocks and masses and parts of the strata 

 are formed entirely of their remains. Immediately below these lime- 

 stones, and conformable with them, lie the red sandstones, several 

 layers of which are perforated with Scolithus burrows." 5 



A brief summary of the Lower Cambrian rocks of Newfoundland, 

 was given by Mr. C. D. Walcott, in a study of the Cambrian faunas of 



1 On Che rocks of Newfoundland. Geol. Mag., new ser., decade II, vol. 4, 1877, pp. 251-262. 



8 On some Primordial fossils from southeastern Newfoundland. Am. Jour. Sci., 3d ser., vol. 16, 1878, 

 p. 225. 



3 Op.oit., p.226. 



4 Hatton, Joseph, andM. Harvey. Geology of Newfoundland. Newfoundland, the oldest British colony, 

 its history, its present condition, and its prospects in the future. London, 1883, pp. 178-187. American 

 edition, Boston, 1883, pp. 150-157. 



Expedition to Newfoundland. Boston Soc. Nat. Hist. Proc, vol. 23, 1886, p. 319. Cruise of the 

 Arethusa. Science, vol. 6, 1885, p. 386. 



