254 



THE CAMBRIAN. 



[BULL. 81. 



143 feet of gray, reddish and greenish limestones. The section is, in 



detail, as follows : 



Foet. 



1. 



Red and gray sandstones, sometimes of a reddish gray; consisting, in the 

 lower part, of a conglomerate composed of rounded pebbles of white quartz 

 from an eighth of an inch to 3 inches in diameter, in a matrix of fine-grained 

 sandstone, made up of whitish and reddish quartz, and white and red feld- 

 spar. A similar fine-grained mixture constitutes the great mass of rock in 

 the upper part. The beds vary in thickness from 3 inches to 3 feet, and many 

 of them are penetrated vertically by Scolithns linearis, about a quarter of an 

 inch in diameter, and always of a lighter color than the surrounding mass. 

 Four feet below the summit there is a bed 3$ feet thick, of a mammillated or 

 concretionary character ; the concretions, which are from 1 to 10 feet in hori- 

 zontal diameter, being composed of concentric layers from a quarter to half 



an inch thick , 231 



Gray, reddish, and greenish limestones, presenting on the strike great diver- 

 sities of character. They sometimes consist of yellow-weathering, massive, 

 nodular, argillaceous limestones, probably magnesian, holding lenticular 

 patches of pure limestone, as well as of red and green shale from 3 to 6 

 feet in horizontal diameter. On the strike these yellow- weathering lime- 

 stones pass in somo parts into gray, compact, pure limestone, in thick, 

 massive beds, while in others they are evenly divided into layers of only 2 

 or 3 inches thick. In Forteau Bay the whole mass appears to be more or 

 less fossiliferous 143 



374 



I examined the collections from these limestones now in the Canadiau 

 Geological Survey collections, and found the following specjes, most of 

 which had been recognized and described by Mr. Billings : 



Palajophycus incipiens. 

 Arcl);eocyathus profundus. 

 Spirocyathes atlauticus. 

 Coscinocyathus billingsi. 

 Iphidea bella. 

 Kntorgina cingulata. 



labradorica. 

 Obolella chromatica. 

 Orthis2 sp. 



Stenotheca elongata. 



rugosa. 

 Hyolithes billingsi. 

 Salterella pulchella. 



rugosa. 

 Olenellus thompsoni ? 

 Ptychoparia miser. 

 Protypus senectus. 

 Solenopleura (like S.nana). 



In describing the extension of the rocks along the north shore of the 

 Straits of Belle Isle, Sir William E. Logan states that they rest on the 

 Laurentian gneiss, and extend along the coast for nearly 80 miles, with 

 a probable breadth of 10 or 12 miles, and slope towards the water at an 

 average of about 60 feet to the mile. In this stretch along the coast 

 they are divided into five or six tabular masses, separted from one an- 

 other by narrow denuded portions of the gneiss. 1 



On the Newfoundland shore sandstones occur that were referred to 

 the Potsdam sandstone from their stratigraphic relations to superja- 

 cent limestones containing Lingulepis acuminata. 2 The data, however, 

 does not fully sustain this reference. Following south along the west 



i Op. cit., p. 287. 



2 Op. cit., p. 289. 



