273 



andesites. The conglomerate may mark the base of an 

 older Cambrian series brought by the assumed fault against 

 the Cambrian strata to the west. If the conglomerate is of 

 Cambrian age, it is evident that the diabase is also of 

 Cambrian or younger age. This would then, also be true 

 of the dykes cutting the granite in the first rock cutting. 



The igneous strata of the railway cut belong to a limited 

 area along the border of the Cambrian basin from which 

 they seem to be separated by a fault . There is no direct 

 evidence that they are not of Pre-Cambrian age and they 

 may be older than the Pre-Cambrian granite. Dr. Matthew 

 writing of the basal conglomerates of the Etcheminian, 

 makes the following statement [2, p. 17] regarding the rocks 



exposed along the railway cut just traversed: " the 



conglomerates are seen to rest on dark purplish-grey, fine 

 grained felsite similar to those of Long island and pre- 

 sumably of the Coldbrookian terrane " The so- 

 called Coldbrookian on Dugald brook, 20 miles (32 km.) 

 to the southwest, contains a fossiliferous zone with Cambrian 

 fossils. 



To the west of the above described rock cut, approaching 

 Young brook, a few exposures of Cambrian sediments occur 

 close to the railway. From the culvert over Young brook, 

 the Cambrian measures are visible in low clifTs extending 

 eastward along the shore. The strata consist of grey, 

 green and reddish slates, sandstones and fine conglomerate 

 faulted, folded and crumpled. Fossils, almost all inarti- 

 culate brachiopods belonging to the genera Lingulella and 

 Lingulepis, are abundant in these strata along the shore 

 west of Young brook and are present, though less common, 

 in some of the strata east of the culvert. Regarding these 

 strata, it has been stated [2, p. 17] that the reddish and 

 purplish beds belong to the lower division of the Etchemi- 

 nian and are cut off by a fault at Young brook from the grey 

 strata of the upper division exposed to the west along the 

 shore and railway as far as Young point. 



In the first rock cut beyond Young brook occur greenish 

 shales and sandy beds with others of lighter coloured sand- 

 stone, also some dark shales. Near the beginning of the 

 rock cut, a synclinal crumple is visible. Beyond this, the 

 strata dip in a fairly constant direction, inland, at high 

 angles. 



At about the centre of the rock cut are a number of thin 

 beds (8 inches and less) of fine, grey sandstone containing 

 35063— 5A 



