70 



both on the Straits of Belle Isle and in the Lake Champlain 

 valley. The presence of Hyolithellus micans, Microdiscus 

 lobatus, and M. speciosus indicates that there is also 

 present a portion of a somewhat older fauna than that 

 occurring with Olenellus thompsoni. ' 



'The origin of the boulders containing the Olenellus 

 fauna is unknown. There is a marked lithological and 

 palseontological similarity between them and the Lower 

 Cambrian limestone of Topsail head and Conception 

 bay, Newfoundland, that points to similar conditions of 

 sedimentation and life, and I found the head of an Olenellus 

 on the Island of Orleans that is of the type of 0. (M.) 

 broggeri of Newfoundland. It is quite possible that the 

 deposits from which the conglomerates were derived exten- 

 ded around the Newfoundland coast, to the west and north, 

 and thence along the margin of the Pre-Cambrian land, 

 southwest, toward the Adirondack mountains of New 

 York, and that the disturbances toward the close of the 

 Cambrian period, in the St. Lawrence valley, resulted in 

 the uplifting of the Lower Cambrian strata and its 

 denudation and breaking up during Upper Cambrian 

 and Lower Ordovician time. ' 



'From Bic harbour, Trois Pistoles, and St. Simon the 

 following species have been found in the conglomerate 

 limestone : — 



Lingulella caelata Agnostus sp.? 



Iphidea bella, Microdiscus lobatus, 



Kutorgina cingulata, Microdiscus speciosus, 



Obolella crassa, Olenellus thompsoni, 



Obolella circe, Olenoides marcoui, 



Obolella gemma, Olenoides levis, 



Orthis, 2 n. sp., Ptychoparia adamsi, 



Platyceras primaevum, Ptychoparia teucer, 



Scenella retusa, Ptychoparia (?) trilineata 



Stenotheca rugosa, Ptychoparia, sp. undt. 



Hyolithes americanus, Agraulos strenuus, 



Hyolithes communis, Protypus senectus, 



Hyolithes princeps, Protypus senectus, var. parvulus, 



Hyolithellus micans. 



'The above fauna proves clearly that there was a large 

 and varied Lower Cambrian fauna in the limestone from 

 which the boulders of the Bic conglomerates were derived, 



