62 THE CAMBRIAN. Ibull.81. 



from Mr. C. Fred Hartt, 1 in which he states that he has recognized four 

 genera of trilobites from the St. John rocks, viz, Paradoxides, Cono- 

 cephalites, Agnostus and a new genus (?) allied to Conocephalites. 

 There are also six species of Brachiopods, belonging to the genera Or- 

 thisina, Discina, Obolella, and Lingula. Although all of tbe species are 

 apparently new, the occurrence of Paradoxides and Conocephalites led 

 Mr. Hartt to correlate the entire fauna with the Primordial fauna of Bar- 

 rande. He states that the lower part of the St. John group, at Gold- 

 brook, has been divided by Mr. Matthew, on lithological grounds, into 

 three bands, viz : 



No. 1. — The lower or arenaceous band, with no determinable fossils, and con- 

 stituting passage beds from the Coldbrook group. 



No. 2. — Argillaceous shales, rich in fossils, Paradoxides, Orthisina ?, Conoceph- 

 alites, Obolella. 



No. 3. — Carbouaceous shales, full of fossils, Paradoxides, Conocephalites, Or- 

 thisina, Discina, etc., all much distorted. 



In the same year Mr. G. F. Matthew described the Azoic rocks of 

 southern New Brunswick. 2 He gave the geographic distribution of 

 the St. John series, and a detailed section of the formation, to which he 

 assigned a total thickness of 4,500 feet. He mentions the identification 

 of the fauna by Prof. Hartt ; and refers the St. John group to the Lower 

 Silurian, correlating it with the Paradoxides harlani beds of Massachu- 

 setts; with the Paradoxides bennetti beds of Newfoundland; the Lin- 

 gula flags of Great Britain; the alum-schists of Scandinavia and 

 u Etage 0" of Barrande in Bohemia. 3 He states that the upper por- 

 tion of the section may be the equivalent of the Calciferous, perhaps 

 the Chazy. The subjacent Coldbrook group is referred to the Huronian, 

 while the terms Cambrian and Huronian are used as synonyms in their 

 application to the Coldbrook formation. 4 



In noticing the discoveries made by Messrs. G. F. Matthew and C. F. 

 Hartt, Dr. J. W. Dawson refers to the correlation made by Prof. Hartt, 

 and proposes to call this series, represented in New Brunswick by the 

 St. John slates, the Acadian series. 5 In 1868 he republished all the facts 

 known to him in relation to the St. John group, naming it the Acadian 

 group, and including it under the Lower Silurian. 6 T^he section given 

 by Mr. Matthew is published, and also descriptions by Mr. C. F. Hartt 

 of all the species discovered by Messrs. Matthew and Hartt in the St. 

 John group. 7 



1 Preliminary notice of a fauna of the Primordial period in the vicinity of St. John, N.B. Obser- 

 vations on the Geology of southern New Brunswick, 1865, pp. 30, 31. 



2 On the Azoic and Paleozoic rocks of southern New Brunswick. Quar. Jour. Geol. Soc, London, 

 vol. 21, 1865, pp. 422-434, map. 



3 Op. cit., pp. 426, 427. 



4 Op. cit., p. 427. 



6 On recent geological discoveries in the Acadian provinces of British America. Am. Assoc, Proc, 

 vol. 16, 1867, p. 118. Canadian Nat., now series, vol. 3, 1868, pp. 295-297. 



6 Acadian Geology. The geological structure, organic remains, and mineral resources of Nova Sco- 

 tia, New Brunswick and Prince Edw. Island, London, 1868, pp. 637-611, 2d ed. 



» Op. cit., pp. 641-657. 



