14 



passing the corner of the Boisdale-Bourinot road. On this road they 

 appear at intervals at several localities to the point where the road 

 descends into the valley of McLeod brook. 



Mr. Fletcher's report 1876-77, page 429, (last paragraph) would in- 

 dicate that there is a considerable manifestation of these rocks and the 

 over-lying conglomerates at the sources of McLeod brook and Indian 

 brook which meet in the upper part of this valley. 



For its whole length the Barachois Cambrian basin from George 

 river station to the source of McLeod brook, is bordered on its southern 

 side by a prominent ridge of Pre-Cambrian syenite. Southward of 

 Long island ferry these rocks reach the water in Barachois harbour, 

 and hence to the head of McLeod brook we see no Coldbrook or 

 Etcheminian rocks on that side of the valley. At Barachois harbour 

 flags and slates of the Juhannian division of the St.John terrane lie 

 along the base of the granite ridge, but from the harbour to the head 

 of the valley of McLeod brook no rocks were seen but those of 

 the Bretonian division of the same terrene. It may be inferred that 

 there is a heavy fault along this side of the valley by which the Cold- 

 brook and the overlying terranes have been depressed, and only the 

 highest part of the Cambrian is visible along the base of this ridge in 

 McLeod brook valley. 



Coldbrook I n the valley of Indian brook on East bay of the Bras d'Or lake, 



valley of volcanic effusives intervene in the same way as in the valley of McLeod 



Indian brook. ^rook between the Laurentian ' Upper Series ' and its intrusive rocks, 



and the marine Cambrian. They are seen on all the small brooks 



tributary to that stream, but are exposed in their entire thickness on 



Dugald brook. (See map opposite.) 



Here the lower half consists of material more or less water-worn ; for 

 the most part a feldspathic sandstone with irregular layers of conglo- 

 merate. The latter have rounded pebble?, some of felsite and others 

 of granite ; the conglomerates are not thoroughly water-worn and have 

 a paste largely feldspathic. This half of the Coldbrook strata is capped 

 by thirty feet of fine gray shale with fossils. These shales, in their 

 slicken sided surfaces and distorted fossils, give evidence of the greater- 

 disturbance and pressure applied here than to the Etcheminian shales 

 of the next terrane above. Some layers have numerous though small 

 phosphatic nodules. 



The shales are succeeded by red and purple earthy felsites, and 

 higher by purplish and purplish-gray amygdaloids. These felsites and 

 amygdaloids seem to take the place in this section of the red felsites of 



