2C6 THE CAMBRIAN. 



tBULL. 81. 



In describing in 1888 (at that time called series B) the Paradoxides 

 zone, or G of the preceding tabulation, the term "stage" replaces the 

 word "division" as heretofore used by Mr. Matthew, and the divisions 

 of the series are given as follows i 1 



Stage 1.— This includes the lower part of the series as high up as Paradoxides are 

 found. The divisions of this stage are as follows : — 

 Band (assise) a. Hard gray sandstone or quartzite. Fossils, none known. 

 Band (or assise) &. Dark-gray sandstones and gray sandy shales. Fossils: 



Ellipsocephalns, Agraulos, Hipponicharion, Beyrichona, etc. 

 Band (or assise) c. Gray shales. Fossils: Paradoxides, Conocoryphe, Li- 



ostracus, Microdiscus, Agtiostus, etc. 

 Band (or assise) d. Dark gray shales. Fossils: Paradoxides, Ptychoparia, 

 Soleuopleura, Microdiscus, Agnostus, etc., of different species from those 

 in assise c. 

 Stage 2. — This consists of gray flags and sandy shales. The subdivisions have not 

 been worked out, but the stage corresponds to the lower half of the Olenus 

 zone in Europe. No species of the genus Olenus have been found in it. 

 Staged. — Dark-gray and black shales. Fossils: Ctenopyge, Kutorgina, Orthis, etc. 

 This corresponds to the upper half of the Olenus zpne of Europe. The 

 shales in Cape Breton, which contain Peltura and Sphaeropthalinus, be- 

 long here. There are in the St. John Basin gray flags, which overlie the 

 • Ctenopyge beds, but no higher stage than the Olenus zone has been estab- 



lished by fossils. 2 



In a series of sections of Cambrian rocks in Acadia, 3 the upper Cam- 

 brian or Olenus beds are shown to be present in St. John County in the 

 Portland section. 



Just as this report is going to press (May 1, 1891) 1 received the fifth 

 contribution of Mr. G. F. Matthew upon the fauna of the St. John 

 Group. In the introduction he gives a description of the structure of 

 the St. John basin and sections of the measures at St.John. He finds 

 that all three of his divisions of the Cambrian are present Division 1 

 he names Acadian, Division 2 Johannian, and Division 3 Bretonian. 4 



The Cambrian rocks of Cape Breton Island are described with many 

 details by Mr. Hugh Fletcher in 1877 and 1878, but the various outcrops 

 do not appear to have been well correlated. The section in McLean 

 Brook, on Little Bras d'Or Lake, is as follows: 5 



Feet 



(1) Carboniferous conglomerate and related rocks 



(2) Feldspathic sandstone and impure limestone, of white, green, amber, red, 



and other colors, mixed, and in distinct beds of different thickness ; some- 

 times associated with greenish, soft, soapy rocks, probably decomposed fel- 

 sites ; iilms of hematite in the joints , 254 



1 On the classification of the Cambrian rocks of Acadia. Canadian Rec. Sci., vol. 3, 1888, p. 73. 



2 Mr. Matthew writes me under date of* October 25, 1890, that he has found the Arenig graptolitio 

 fauna in the St. John series, thus establishing the presence of the Lower Silurian (Ordovician) fauna 

 above the Olenus zoue. 



3 Matthew, G. F. On the classification of the Cambrian rocks in Acadia. No. 2. Canadian Rec. Sci., 

 vol. 3, 1889, p. 308. 



4 Illustrations of the fauna of the St. John Group, No. 5. Royal Soc. of Canada, Trans., vol. 8, 1891, 

 p. 129. 



6 Report on the geology of part of the counties of Victoria, Cape Breton, and Richmond, Nova Sco- 

 tia. Geol. Sur. Canad. Rept. Prog, for 1876-77. Montreal, 1878, p. 43L 



