271 

 DETAILED DESCRIPTION. 



The Intercolonial railway from George River station to 

 Young point closely follows the shores of St. Andrew 

 channel. To the north, across the waterway, lies Boular- 

 derie island mainly underlain by Millstone Grit measures 

 with strata of the Limestone series outcropping along the 

 shores. On the south side of the railway the land rises 

 quickly to heights of 600 feet (180 m.) to 700 feet (215 m.) 

 above the sea. 



The geological section developed along the railway is 

 transverse to the axis of the Boisdale hills and cuts across 

 them at their northern end. At the eastern end of the 

 section, the Pre-Cambrian granite is exposed. Proceeding 

 westward, the granite is followed, according to Matthew, by 

 Coldbrookian and then by Etcheminian strata. 



The rocks in the first cutting east of George River 

 station consist of pink granite traversed by a number of 

 parallel dykes of diabase dipping at high angles. The 

 granite is presumably of Pre-Cambrian age ; the dykes are 

 possibly much younger. The dykes vary greatly in width 

 and individually send parallel off-shoots into the granite. 

 The rocks are much fractured and, in places sheared. As 

 a result, the rocks along the walls of some of the dykes 

 resemble a conglomerate. Referring to the basal con- 

 glomerate of the Etcheminian, Dr. Matthew makes the 

 following statement [2, p. 17]; "In the railroad cutting at 

 George River station the contact of these conglomerates 

 with the syenite (i.e., granite) can be seen at several places. 

 They fill hollows in the syenite." 



A small outcrop of granite occurs on the south side of 

 the railway, a short distance west of the first brook crossing 

 the railway west of George River station. This is the last 

 exposure of granite. The rock does not outcrop on the 

 shore. It is visible at a number of points on the eastern 

 slopes of the valley in which flows the small brook just 

 crossed. The granite body is known to extend for an 

 indefinite distance southward. The western boundary of 

 the granite probably lies about 100 yards (90 m.) west of 

 the isolated exposure on the railway. The relations exist- 

 ing between the granite and the rocks exposed in the first 

 rock cut to the west of the brook are not known. Nowhere 

 in the immediate neighborhood has the granite or its 

 apophyses been found penetrating the rocks of this cut. 



