CAMBRIAN AND LOWER ORDOVICIAN. 141 



Lower Cambrian (Etcheminian of Matthew) — Continued. Feet. 



2c. Reddish-purple to brick-red argillaceous shale 56 



The following fossils occur in the central and lower portions of this band.: 

 Obolella atlantica. 

 Microdiscus bellimarginatus S. & F. 

 Microdiscus n. sp. 

 Olenellus (Holmia) broggeri. 

 Zacanthoides sp. undet. 

 Agraulos sp. 

 Micmacca walcotti. 

 2d. Brick-red and pinkish nodular limestone in layers varying from 3 feet to 6 inches in 



thickness 27 



This is one of the most important horizons in the Lower Cambrian of Newfoundland 

 (Smith Point limestone). It is very peraistent about Trinity Bay, and it occurs, 

 although much thinner, at various exposures in Conception, St. Marys, and Placentia 

 bays. The upper 24 feet at Smith Point is practically solid limestone layers. The 

 lower layer of limestone, 1 foot in thickness, is separated by 2 feet of reddish shale in 

 which 3 inches of limestone occurs. 

 Fossils: In the upper 6 inches of the top layer of limestone numerous fragments of.OZc- 

 nellus (H.) broggeri and Solenopleura? occur. About 3 feet below this, in the next 

 bed of limestone, immense numbers of Hyolithes princeps are found in association 

 with the fauna that marks this limestone band where^'er it is found. The following 

 species were collected in a few hours: 



Iphidea labradorica (Kutorgina granulata M.). 



Fordilla troyensis. 



Scenella reticulata? 



Randomia aurorse. 



Helenia bella. 



Orthotheca pugeo. 



HyoUthes princeps. 



Coleoloides typicalis. 



Hyolithellus micans? 



2e. Green argillaceous shale 23 



2f. Massive stratum of nodular limestone, divided into 18 inches of a pinkish limestone and 

 3 feet of purple to a pink mixed with purple argillaceous shale. Fossils: Coleoloides 



typicalis 4 J 



2g. Green argillaceous shale in massive bands, with numerous small pinkish limestone 

 nodules scattered irregularly, on the line of bedding. At 51 feet from the base the 

 limestone nodules increase in number and size and form the greater part of a layer 2 

 feet in thickness. Above this the reddish-purple and green shales occur in bands 



varying in thickness 62 



Fossils: 



Hyolithes rugosus Matt.? 

 Coleoloides. 



Urotheca pervetus Matt. 

 Crustacean, n. g., n. sp. 

 2h. Reddish-purple ai^illaceous shales, with irregularly distributed bands of nodular lime- 

 stone of varying thickness. A layer of nodular limestone 42 feet from the summit has 

 12 inches of pinkish and reddish-purple limestone above, with 10 inches of greenish 

 limestone below. In both layers numerous tubes of Coleolides occur. At 66 feet 

 below the summit a second band of nodular limestone 20 inches in thickness occurs. 

 Thin layers of nodular limestone occur both above and below the two thicker bands 



mentioned 136 



2i. Green argillaceous shale, with a few thin layers of p\irple shale, also scattered layers of 

 pinkish-colored nodular limestone. Fossils: Annelid trails are abundant in some 



portions of the greenish-colored shales 30J 



2j. Reddish-purple shale, with layers of greenish and pinkish-colored limestone nodules 

 scattered irregularly on the line of bedding. The nodular limestones are usually 

 from 2 to 4 inches in thickness, but at 60 feet from the top a layer 12 inches thick 



occurs .- 185 



The section is here cut off by the drift coming down to the water's edge. 



