260 THE CAMBRIAN. [bull. 81. I 



The section on the mainland beneath Topsail Head, Conception Bay, 

 was found to be as described by Dr. Murray. 1 The limestone at the base 

 is separated from the "Iluronian" rocks by a fault line. Over the lime- 

 stone 100 feet or more of greenish shale completes the section. In the 

 limestones were found : 2 



Obolella atlantica. Microdiscus speciosus. 



Kutorgina labradorica. Microdiscus, sp. undet. 



Scenella reticulata. Olenellus (H. )broggeri. 



Hyolithellusmicans. Avalonia manuelensis. 

 H. micans var. rugosa. Solenopleura bombifrons. 



Hyolithe's princeps. Agraulos (S.) strenuus. 



impar. Agraulos (S.) sp. ? 



In tbe superjacent green shales a few fragments of a trilobite were 

 observed that indicated by a portion of the glabella and eye-lobe a 

 large species of Paradoxides. The evidence here obtained of the rela- 

 tion of the Olenellus and Paradoxides faunas being somewhat incon- 

 clusive, the section at Brigus Head, on the west side of Conception Bay, 

 was next examined and found to be essentially tbe same as that at Top- . 

 sail Head, with the addition of a greater thickness of green and red 

 shales above the limestone, and a sandy deposit beneath the limestone 

 which rested unconformably against the "Huronian." The limestone 

 series is divided into three bands. In the lowest, a specimen of Byoli- 

 thes impar was found, similar to that in the limestone at Topsail Head) 

 associated with fragments of Olenellus (E.) broggeri^ Microdiscus helenm 

 and Ptychoparia f sp. (?). In the second bed of limestone, fragments of 

 trilobites were seen ; and in the upper bed Olenellus (H.) broggeri and 

 Agraulos strenuus were observed, the latter in great abundance. No 

 fossils were discovered in the superjacent slates. 



The stratigraphic succession on ManuePs Brook, as measured by me 

 in August, 1888, is as follows : 3 



Manuel's brook section. • 



Feet. 



(1) Coarse conglomerate, in massive layers. The material next to tbe gneiss 



varies in size from bowlders of quartz and gneiss 6 feet in diameter 

 down to small pebbles, and in the upper beds from pebbles to tine sand. 35 



Strike N. 80° E. (Magnetic) ; dip 12° to 13° N. 



(2) Irregular beds of calcareous sandstone, siliceous limestone, and greenish- 



colored argillaceous shale, covering the irregular upper surface of the 



conglomerate to 25 



Fossils: Obolella atlantica, HyoWhellus micans, Helenia bella, Hyo- 

 lithes princeps, H. impar, U. qu adrico status, H. similis, H. terranoricus, 

 Scenella reticulata, Stenotheca nt<70sa, varieties acuta- costa ,erecta , hrris and 

 pauper, Platyceras primocvum, Microdiscus Helena, M. speciosus, Olenellus 

 (jBT.) broggeri, Avalonia manuelensis, Agraulos (S.) strenuus and var. na- 

 sutus, Solenopleura bombifrons, S. harveyi and S. howleyi. 



1 Op. cit,, p. 154. 



2 Walcott, C. D: Stratigraphic position of the Olenellus fauna in North America and Europe. Am. 

 Jour. Sci , 3d ser., vol. 37, 1889, p. 378. 



» Op. cit, pp. 380, 381. 



