LOWER CAMBRIAN TERRANE 335 



doxides fauna, ^ but in 1895, when speaking of the Manuels 

 Brook conglomerate and sandstones, he says '? 



No fauna of trilobites has yet been found below this sand- 

 stone. Here, then, should be drawn the line between Cambrian 

 and pre-Cambrian. 



Above this limit there have thus far been found on the At- 

 lantic coast of America the following trilobite faunas : 



TT /->!,• ( Peltura fauna. 



Upper Cambrian...-^ ^, . 



^^ \ Ulenus rauna. 



T /^ 1 • ( Paradoxides fauna. 



Lower Cambrian...^ r\^ ^^ e 



[ Ulenellus launa. 



He further concludes that the Protolenus fauna is in this region 

 more primitive than the Olenellus fauna, but conjectures that it 

 may have been contemporary with the latter elsewhere.^ 



In 1897 Mr. Matthew contends that the presence of Dorypyge 

 in the ' Hastings Cove fauna ' establishes a strong connection 

 with the Olenellus fauna, and that, from the established succes- 

 sion of Cambrian faunas in Lower Cambrian beds in Scandi- 

 navia, Wales, and elsewhere in Eastern Canada, "we are 

 therefore compelled to assume that the Hastings Cove fauna is 

 as recent as the Upper Paradoxides beds."* 



In speaking of Olenellus in reviewing ' Billings's Primordial 

 Fossils of Vermont and Labrador,' Mr. Matthew says :° 



The other Primordial form described by Billings therein were 

 the two Olenelli, O. Thomfsoni and O. Vermoniatia, two 

 Salterellas, and Plantse, Protozoa and Brachipoda. From the 

 following remarks it will be seen that in the opinion of the writer 

 the study of Billings's types has thrown considerable light on the 

 geological horizon of Olenellus, and appear to link this genus 

 with the Middle rather than the Lowest Cambrian. 



It is only just to Prof. Jules Marcou to say that this is the po- 

 sition which he has contended for as the true age of Olenellus, 

 determined by him from a study of the geology in the vicinity 

 of Swanton, Vt., and Point Levis, near Quebec. I think he 



' On the Classification of Cambrian Rocks in Acadia : Can. Rec. Sci., Vol. IV, 

 1889, pp. 303, 304. 



2 The Protolenus Fauna : Trans. N. Y. Acad. Sci., Vol. XIV, 1895, p. 103. 



'Loc. cit., p. 152. 



♦Studies of Cambrian Faunas : Trans. Roy. Soc. Can., 2d Ser. Vol. II, Sec. 

 IV, p. 193. 



^ Ivoc. cit., pp. 194, 195. 



