66 THE CAMBRIAN. [bull. 81. 



worms, tracks, and an unrecognized brachiopod. This paper was fol- 

 lowed in the same year by an article on the classification of the Cam- 

 brian rocks of Acadia in which the classification of the Cambrian sys- 

 tem in Acadia and Newfoundland is given as follows: 1 



Series A.— The Basal series or Eteminian. 

 Series B.— The St. John group or Acadian. 

 Series C. — The Lower Potsdam or Georgian. 

 Series D. — The Potsdam sandstone and limestone. 



The division of series A was noticed in the preceding paper by Mr. 

 Matthew. In series B he includes the zone of Paradoxides ; describes 

 the rocks in detail, and gives lists of the genera of the fossils. Series 

 O, the Lower Potsdam of Billings, he states has not been recognized on 

 the mainland of Acadia, but is found in the Island of Cape Breton, 

 where the fossils are Bathyurus, Orthisina, Orthis, Hyolithes jprinceps. 

 This series is placed provisionally above B. 2 Series D, or the Pots- 

 dam series of New York and the Mississippi Valley, is stated to be ab- 

 sent from New Brunswick and, as far as known, from the eastern 

 border of the continent. 3 



A reclassification of the Cambrian rocks of North America was pub- 

 lished in 1888 by Mr. C. D. Walcott as follows: 4 



Table I. — Lower Silurian (Ordovician) system. 



Subdivisions. 



Terranes. 



Faunas. 



Upper Cambrian 





Dicellocephalus or 



Olenus. 

 Paradoxides. 



Middle Cambrian 





Lower Cambrian 





Olenellus. 









This is followed by a comparison of typical sections of the Cambrian 

 system in Sweden, Newfoundland, New York, and the Rocky Mountains. 

 The section on Manuel's Brook, Conception Bay, Newfoundland, where 

 the true stratigraphic succession of the Cambrian deposits in America 

 was first discovered, is given in detail. 



On learning of the discovery of the Olenellus fauna beneath the 

 Faradoxides zone in Newfoundland, Mr. Matthew published a second 

 paper u On the classification of the Cambrian rocks in Acadia," in 

 which he arranged the Cambrian system as it occurs in Acadia as 

 follows: 5 



Localities. 



D. Upper Cambrian (Potsdam series) Unknown. 



C. Middle and Lower Cambrian — Acadian series St. John, etc. 



B. Lower Cambrian— Georgian series Cape Breton. 



A. Basal Cambrian — Etcheminian series St. John, etc. 



•Matthew, G. P. On the classification of the Camhrian rocks of Acadia. Can. Rec. Sci., vol. 3, 1888, 



p. 72. 



* Op. cit. , pp. 73-74. 3 Op. cit. , p. 80. 



4 The stratigraphical succession of the Camhrian faunas in North America. Nature, vol. 38, 1888, 

 p. 551. 



6 On the classification of the Camhrian rocks in Acadia. No. 2. Can. Rec. Sci., vol. 3, 1889, p. 310. 



