﻿Problems in Quebec Geology. 499 



their true place beneath the crystalline rocks of the 

 Sutton Mountain anticlinal axis, at that time regarded as 

 the metamorphic development of the Sillery. The series 

 of foldings to which these mountain rocks have been 

 subjected has resulted in enclosing not only certain areas 

 of the Sillery strata but also of the Trenton as well. 



The rocks of Phillipsburg, about which there has long 

 been much dispute, have recently been carefully studied 

 by the aid of their contained fossils as well as from their 

 stratigraphical relations, and satisfactory conclusions as to 

 their structure and true position have been reached. 

 They have been paralleled with the Levis formation, both 

 on the evidence of their contained fossils as well as their 

 general features. Along the shores of the Mississquoi 

 Bay they are separated by a fault from the beds of 

 the lower Trenton, the conditions of the two series being 

 apparently similar to those seen on the north side of the 

 island of Orleans. The lowest beds of the Phillipsburg 

 series are apparently the transition beds between the 

 Calciferous and the Potsdam sandstone formations. There 

 is then a gradually ascending series through somewhat 

 crystalline strata into the fossiliferous beds of the 

 Calciferous till the overlying shales of the Chazy are 

 reached, a short distance west of the railway at St. 

 Arraand station. These Chazy shales are associated with 

 limestone beds which hold fossils ; and occupy a synclinal 

 which extends north-easterly to Bedford and on to 

 Stanbridge. While these are separated on the west from 

 the Trenton strata by a fault, they, on the east, pass 

 upward gradually into the Farnham beds of the lower 

 Trenton, the whole series in this direction lying in a 

 broad synclinal basin. The succession, therefore, from 

 the base of the Phillipsburg series appears to be quite 

 regular, though the fossils are not exactly identical with 

 those found in the typical Calciferous and Chazy which 

 they are held to represent. They are evidently distinct 



