144 INDEX TO THE STRATIGEAPHY OF NORTH AMERICA. 



Lower Cambrian downward — Continued. Feet. 



Ic. Reddish, and greenish arenaceous and argillaceous shales and thin-bedded sandstones, 

 with a few thin interbedded calcareous sandstones. Strike N. 65° E., dip 3-5° to 

 40° NW 30 



Fossils: In a thin reddish-brown, slightly calcareous sandstone occur great numbers of 

 a slender species of Hyolithes that resemble H. communis. Just below it I noted, in 

 a hard, very fine grained, compact sandstone, specimens of Coleoloides like C. 

 typicalis and a large Iphidea labradoricaf This appears to be the horizon of the 

 Hyolithes limestone fauna of the Smith Sound section of Newfoundland. Unfor- 

 tunately the sediments are of a type in which fossils are rarely found well preserved. 



2. Reddish-purple conglomerate in fine sandstone matrix. White quartz and reddish and 



greenish siliceous pebbles occur, some of which are from 2 to 6 inches in diameter. 

 Strike N. 65° E., dip 40° NW , 31 



3. Reddish-purple to grayish-purple fine-grained sandstones, passing into flaggy gray and 



greenish-gray micaceous sandstone, interbedded with thick layers of sandstone 395 



About 120 feet down a few layers of white quartz pebbles appear in the dark sandstone, 

 and at 175 feet down broad annelid trails were seen on the smooth surface of a thick 

 layer of sandstone. 

 The dip decreases from 40° at the top to 30°, and then 25° at the base, where the strike 



is N. 55° E. 

 At this point the upper beds of the basal conglomerate outcrop on the south side of the 

 brook, but they are cut off a few feet down by a fault that brings up some of the beds 

 of No. 3 of the section, and possibly No. Ic. On the north side of the brook a syncline 

 and fault expose a considerable portion of No. 3 of the section. Up the brook the 

 basal quartzite appears again beneath the sandstone of No. 3, from which it extends 

 nearly to the contact with dark pyroclastic andesitic rocks of the Algonkian. 



4. Rather coarse siliceous, massive-bedded conglomerate, formed of white quartz, jaspery 



reddish and greenish-colored pebbles. The upper 8 feet has a light-gray color that 

 passes below to a purplish tint 128 



Total of Lower Cambrian 1,040 



The contact with the Algonkian rocks is not seen, the base of the conglomerate being con- 

 sidered as near the last angular bowlders of the conglomerate seen in the bank, a little distance 

 below the outcrop of Algonkian rocks. 



