324 WALCOTT 



this region, or are beneath the beds containing the fauna de- 

 scribed by Mr. Matthew. , 



Unconformity at Base of St. John Group and Equiva- 

 lent Horizon in Newfoundland. 



Almost from the beginning of his studies of the Cambrian 

 rocks about St. John, New Brunswick, Mr. Matthew inferred 

 that there was an unconformity between the St. John quartzite 

 and the subjacent red, green, and gray shales and sandstones 

 that occur in the vicinity of St. John and in Long Reach Valley. 

 In J 888^ he based the unconformity on the variation in thickness 

 of these lower deposits ; and from the descriptions given by Mr. 

 Alexander Murray of the red, green, and gray slates and sand- 

 stones below the Paradoxides-bearing shales of Trinity, St. 

 Marys, and Placentia Bays, Newfoundland, he inferred that 

 they were also unconformably beneath the Paradoxides beds. 

 He says :^ 



The conglomerate at Manuel Brook, Conception Ba}^, and the 

 standstones elsewhere at a corresponding horizon, appear to 

 mark the break between this series and the higher part of the 

 Cambrian rocks in Newfoundland. 



In a paper read in 1889^ he says : 



The Basal series in Acadia, though unconformable to the St. 

 John group, is closely related to it in its distribution. 



In a later paper presented to the New York Academy of Sci- 

 ences in 1895, when speaking of the 'Etcheminian' series, 

 he says:^ 



In New Brunswick there is a definite base of conglomerate to 

 this series, but in Newfoundland the base has not been shown. 

 Olenellus having been found in Newfoundland above this series, 

 the series is there clearly pre-Cambrian.* 



No authority is given for the statement that Olenellus has 

 been found above the ' Etcheminian ' series. 



1 On a Basal Series of Cambrian Rocks in Acadia : Canadian Record of Sci- 

 ence, Vol. Ill, No. I, 1888, p. 22, 23. 



•Loc. cit., p. 23. 



' On Cambrian Organisms in Acadia : Trans. Roy. Soc. Canada, 1889 (pub- 

 lished in 1890), Vol. VII, Sec. IV, p. 137. 



*The Protolenus Fauna : Trans. N. Y. Acad. Sci., Vol. XIV, 1895, pp, loi- 



153- 



^Ivoc cit., p. 105. 



