FOEMATIONS OF QUEBEC AND EASTERN ONTARIO. 29 



part, devoid of traces of organic life, only a couple of lingulfe or obolellse, a few remains of 

 sponges and some graptolites being as yet found. Of the graptolites the forms are in some 

 eases identical with those which occur in the lower part of the Levis formation, and which 

 in fact, extend downward at certain places into the underlying beds of the Sillery. 



When we examine the boulders of limestone which occur in the Sillery conglomerate we 

 find them to contain an abundance of fossils of Primordial aspect, among which Olenellas 

 Thoinpsoni, etc., is conspicuous. The beds from which these pe1)l)les were derived have not 

 yet been discovered in situ along this part of the coast, but it is not at all improbable that 

 they occur at various places. Thus near St. Roch des Aulnets, in the dark slates of division 

 two ' of the Sillery formation certain beds of limestone, some of which are several feet thick, 

 are found, which contain trilobites of Primordial types, among which is an a(/?jos<MS presumably 

 of about the same horizon as the Olenellus fauna, while at Matane the dark slates have also 

 yielded Primordial trilobites. It may be remarked that these beds at St. Roch and Matane 

 are presumably several thousands of feet below the conglomerates of the upper Sillery formation 

 in the pebbles of which the Olenellus fauna was found, and from which they are separated by 

 faults of very considerable extent. These older beds appear from beneath the red and green 

 slates of the upper Sillerj- in the forms of anticlinals, and it is very probable that a careful 

 study of some of the massive calcareous beds would show an al)undance of Primordial fossils, 

 as their examination hitherto has been comparatively slight. The fact of the presence of this 

 lower series carrying a typical Primordial fauna solves to a large extent the problem as to 

 the source of the boulders found in the upper Sillery conglomerates, since these lower 

 beds have been reported at a number of points along the south side of the St. Lawrence just 

 as in the case of the conglomerates of the upper Sillery. These are found at Beaumont, the 

 island of Orleans, Bic, Métis, Grosses Roches, Ste. Anne des Monts, as well as at other places 

 almost to the extremity of the Gaspé peninsula. 



In the Geol. Survey report, 1887, by the writer, on the country bordering upon the lower 

 St. Lawrence, all the Sillery beds were assigned to the Cambrian, following the views held 

 at that date that the Calciferous beds should mark the close of the Ordovician or Cambro- 

 Silurian system, while the Potsdam should constitute the upper member of the Cambrian. 

 Referring to this. Prof. "Walcott, in 1890,- in his review of this report, says that on palœon- 

 tological grounds the red shales of the Sillery should be included in the Levis division or 

 the overlying graptolite beds of Point Levis. The conclusions he thus expresses couiirm 

 exactly the views put forth in this paper, and unite the Calciferous (Levis) with the typical 

 Potsdam sandstone formation (upper Sillery). The lower Sillery therefore, comprising all 

 below division four of the arrangement of the Sillery and Levis rocks made in 1888, will fall 

 naturally, both on stratigraphical and palteontological grounds, into the Cambrian system.' 



Between the rocks of the upper Sillery formation and the schists of the ISTotre Dame 

 range of mountains, which traverse the township of Quebec from the Vermont boundary to 

 Gaspé, there is a very considerable development of black, green and purple slates with 

 quartzite. These have not yet yielded fossils, but they are apparently the ecpiivalent of 

 certain groups of strata which come out in part on the St. Lawrence below Quebec city and 

 represent the Cambrian or lower division of the Sillery. Their extension southward has 



' Report of Geological Survey, 1887, p. 65, K. 



2 Amr. Jour., Science, 3 Ter., vol. 39, 1890. 



' Report of Geological Survey, 1887, p. 64, K. 



