LOWER CAMBRIAN TERRANE 3II 



Feet, 

 ik. Reddish-purple and green argillaceous slates, cleaned so 

 as to make a good roofing slate, at Bryant's quarries 

 about I mile east of Hickmans Point. The estimated 

 thickness of this slate in the syncline is over 200 feet.. 200 -f- 

 The total thickness of the section up to the Hyolithes lime- 

 stone 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. 



Fosters Point Section. — At Fosters Point, on the southeastern 

 end of Random Island, the Smith Point (Hyolithes) limestone is 

 well shown. The strata are nearly vertical and are cut by- 

 dykes of greenstone. This distributed condition extends up- 

 ward in the section nearly to the Paradoxides davisi bed, where 

 the dip is more regular. The Olenus horizon was found at an 

 estimated distance of 200 feet above the Paradoxides zone, where 

 Olenus is associated with several species of Ostracods. Above 

 this there are nearly 1000 feet of shales and interbedded sand- 

 stones, much like the lower portion of the Great Belle and 

 Kelley Island section of Conception Bay. 



SOUTHEAST SIDE OF TRINITY BAY. 



Hearts Delight Section. — On the south side of Hearts Delight 

 Harbor the sandstones of the Algonkian Random terrane, be- 

 neath the Cambrian, dip to the northwest at about 75°, the 

 Cambrian conglomerate and shales above having the same 

 strike and dip. 



Lower Cambrian., upward. — Inches. 

 la. Conglomerate formed of bits of Random gray sandstones, 

 fragments of reddish sandstone, dark sandy shales, 

 quartz jDcbbles, etc., with a calcareous sandstone matrix, 

 3 to 8 inches thick. 

 This conglomerate is spread over the irregular upper sur- 

 face of the Random sandstone. It is slightly calcareous 

 in places, and looks very much like the the basal bed of 

 the Random Sound Lower Cambrian. The best section 

 of it on the east side of Trinity Bay is exposed on Hope- 

 all Hill, at the entrance of Ilopeall Harbor, about 8 

 miles south of Hearts Delight. 

 At Spread Eagle Point, opposite Dildo, the basal con- 

 glomerate is from 24 to 30 inches in thickness, with thin, 

 irregular layers of limestone in the upper portion that 

 contain immense numbers of Coleoloidcs and a small 

 Obolella-\\\i& shell 3-8 



