58 



Levis at the base, and it was said that these measures 

 overlie the quartzite of the narrow band of Potsdam below 

 the falls [6, p. 132]. The Lauzon is described as consisting 

 of green and red shales with bands of gray sandstone and 

 beds of limestone conglomerate. These calcareous meas- 

 ures were said to be fossiliferous in places, as in the case 

 of an exposure on the banks of Riviere du Loup near the 

 railway station. 



During the two decades following 1868, various workers 

 were engaged on problems connected with the Quebec group 

 as \developed throughout the long belt occupied by this 

 assemblage. As a result of this long continued effort, 

 radical changes were made in the general conception of the 

 nature and composition of the group. A brief abstract 

 of the views held from time to time has been given by R. W. 

 Ells (3). As regards the development of the Quebec 

 group in the area to the northeast of Levis, the main 

 conclusions arrived at were, that the Sillery was older, 

 not younger than the Levis; the Lauzon division was 

 merged in the Sillery; the Sillery was considered to be 

 of Upper Cambrian age, and the Levis to be of Lower 

 Ordovician, pre-Trenton age. A division of the Cambrian 

 older than the Sillery was also recognized as existing in 

 the same general region. In the neighbourhood of Riviere 

 du Loup, however, Richardson's subdivisions were dis- 

 carded and the whole group of strata were referred to the 

 Sillery [3, pp. 67-70]. The measures thus treated included 

 the quartzites which both Logan and Richardson had 

 separated as underlying the Sillery. 



In a later report by L. W. Bailey and W. Mclnnes [1], 

 the character and structure of the Quebec Group strata 

 as developed over a large extent of territory east and 

 northeast from Riviere du Loup is described, and the 

 conclusion arrived at that virtually all the strata belong 

 to the Sillery division and are arranged in overturned 

 folds with prevailing southerly dips and traversed by thrust 

 faults. It is specifically stated [1, p. 22], that there is no 

 apparent reason for the separation as Potsdam of any 

 portion of the strata in the vicinity of Riviere du Loup 

 from any other portions of the series. 



Recently, in 1908, J. A. Dresser carried a geological 

 reconnaissance over the greater part of the belt of the 

 Quebec Group lying between Levis and Riviere du Loup. 

 The results of this work are expressed on a map [2] on which 



