466 K. W. ELLS — STRATIGRAPHY OF THE "QUEBE< GROUP." 



to the Lowest place, and should be regarded as beneath those of the fossil- 

 iferous Levi- formation. 



During the summer of 1889 the rocks about Quebec and Levis were ex- 

 amined with some care by Mr. C. I>. Walcott,of Washington. The pecu- 

 liar fauna- from the limestone conglomerates, both from the Sillery portions 

 on the Bouth side of Orleans island and from the Levi- formation at Levis 

 and >t. Joseph, were Btudied with some minuteness. The purely Cambrian 

 aspect of the fossils from the former was clearly recognized, while in those 

 of the Latter the Cambrian forms were found to be entirely confined to the 

 pebbles, the matrix of the rock being comparatively rich in fossils peculiar 

 to the Calciferous formation. The hands from which these mixed faunas 

 were taken were at the very base of the fossiliferous Levis series and almost 

 directly overlying the red shales of the .Sillery which were brought into 

 view along the denuded crest of one of the overturned anticlinals already 

 described, thus again confirming the sequence of strata and the relative 

 positions of the Levis and Sillery formations determined by the stratig- 

 raphy as stated in the preceding pages. 



Conclusions. 



I>riefly stated, then, the " Quebec group," as originally constituted. i- held 

 to he divisible into at least five distinct portions, in ascending order as fol- 

 low 



1. A pre-Camhrian series, comprising the crystalline schists, limestones, 

 gneisses, and the associated dioritic, chloritic, and epidotic rocks which form 

 the axes of the several principal anticlinals. 



2. A lower Cambrian series, composed of black, green, gray, and occa- 

 sionally purple slates, with hard quartzites, at times containing much quartz 

 in the form of veins, as well as through the mass of the rock it-elf. In it- 

 lower pari ii contains conglomerates holding pebbles derived from the under- 

 Lying series, and Berpentines are an important feature. 



■'!. A.n upper Cambrian Beries, composed largely of red and green shales 

 with green and gray -ami-tone-, with which beds of lime-tone conglomerate 

 sometimes occur, the pebbles of which contain fossils of Primordial age, 

 while the -late- hold obscure graptolites, Lingula ami Obolella. The-.- rep- 

 ot what wa- formerly Btyled Sillery and Lauzon. 



I. A N < trdovician or ( iambro-Silurian Beries, c imposed of black, graj . and 

 greenish shales, with bands of dolomite ami ana- of limestone conglomerate, 

 from the pebbles of which Potsdam fossils are obtained and from the paste 

 others of Calciferous age, the rock- occupying synclinals in the underlying 

 Silhry division. This is the Levis proper. 



