142 INDEX TO THE STRATIGEAPHY OF NORTH AMERICA. 



The nodular limestones of the Smith Point section are one of the most noticeable features 

 of the lower portion of the section. * * * TJ^e only fossils found in the lower part of the 

 section except annelid trails occur in the nodules. The bedding planes of the shale in the 

 slate quarries on Smith Sound are clearly indicated, at nearly right angles to the cleavage, 

 by the lines of scars left by the nodules. 



Base of Cambrian in Smith and Random sounds. — ^The base of the Cambrian is exposed 

 at the slate quarries east of Tilton Head, on the north side of Smith Sound, in the synclinal 

 basin formed of the Avalon and subjacent Cambrian rocks. The section, however, is not 

 here complete. On the south side of Smith Sound, near Britannia Cove, the Smith Point 

 limestone, carrying Hyolithes, etc., is well exposed, and 220 feet above it, in the green shales, 

 OleneUus (H.) iroggeri was found. Below, the limestone beds are much broken. Crossing 

 Random Island from Britannia Cove to the north shore of Random Sound, one finds a much 

 more complete section, east of Hickmans Harbor Point. At Hickmans Harbor Point the 

 Signal Hill conglomerate of the Avalon series is well exposed, and above, to the eastward, the 

 Random terrane. The summit of the latter is very beautifully shown at the slate quarries 

 about half a mile east of Hickmans Point, where the strike of the upper bed of the Random 

 sandstone is N. 50° E., dip 70° SE. Immediately on this band of reddish-tinted sandstone 

 there is a thin layer of conglomeratic limestone that forms the basal bed of the Cambrian. 



Random Sound section, upward: Ft. in. 



la. Conglomerate formed of small«pebbles of the subjacent Random rocks, and small quartz 

 grains and pebbles, all cemented together by a fine calcareous sandy matrix. Often 



there is scarcely a trace of calcareous matter 6 



Fossils: Slender tubes of Coleoloides and fragments suggest Archseocyathus. 

 lb. Reddish-purple sandstones capped by coarse-grained grayish-purple sandstone 6 inches 



thick 3 



Ic. Pinkish-colored limestone with Coleoloides.' 6 



Id. Reddish-purple argillaceous shale 10 



le. Purple to pink, hard, irregular arenaceous limestone IJ 



Fossils: Coleoloides and sections of what appears to be a small Obolella-like shell. 

 If. Green and reddish-purple argillaceous shale in broad bands. At 140 feet up nodular 

 limestone appears, and at 170 feet a band of pinkish-colored limestone 6 inches thick 



with Coleoloides 171 



A change of dip and overturn occurs here, which breaks the section and cuts out prob- 

 ably 100 feet or more of the shales. Estimated 100 



Ig. Green argillaceous shale 42 



Ih. Reddiah-purple argillaceous shale :? 98 



li. Greenish argillaceous shale 84 



Ij. Pinkish-colored, massive-bedded nodular limestone 6 



Fossils: Hyolithes princeps, Coleoloides typicalis, also numerous fragments of small 



Hyolithes, of which, owing to the cleavage of the limestone, it was impossible to get 



good specimens. 



Ik. Reddish-purple and green argillaceous slates, cleaned so as to make a good roofing slate 



at Bryant's quarries, about 1 mile east of Hickmans Point. The estimated thickness 



of this slate in the syncline is over 200 feet 200-|- 



The total thickness of the section up to the Hyolithes limestone is over 500 feet, which, 

 with the 369 feet above the limestone at Smith Point, gives a total thickness of fully 

 900 feet for the Lower Cambrian on the western side of Trinity Bay. 



In the city of St. John [New Brunswick] the examination of the outcrops led me to the 

 conclusion (a) that the Lower Cambrian strata beneath the St. John quartzite had been 

 deposited on and against an irregular, uneven shore line; (&) that the sands of the St. John 

 quartzite had been spread conformably over the beds of the Lower Cambrian ("Etcheminian"); 

 (c) that where the pre-Cambrian (Algonkian) rocks projected above the Cambrian beds, 

 or formed the shore lines, the St. John quartzite conformably overlapped the reddish- 

 purple and greenish-colored arenaceo-micaceous shales and thin-bedded sandstones of the 

 Lower Cambrian- ("Etchemi n ian") and came in unconformable contact with the Algonkian 

 rocks. * * * 



