THE PICTOU COAL FIELD — POOLE. 253 



pools series. The most westerly exposure of Silurian already re- 

 ferred to protruding immediately west of the Mountville post 

 office is in line east and west with exposures of grey conglomer- 

 ate in parts cemented by volcanic ashes and the neck of trap 

 that forms the western escarpment of the crest of Weaver's 

 mountain. This neck has limestone lying against it to 

 the south and a conglomerate similar to that just mentioned on 

 its north flank. The age of this deposit is undetermined. Ap- 

 parently it is contemporary with that of the trap and prior to 

 that of the Lower Carboniferous conglomerate. 



The lowest of the series are seen north of Riverton and nearly 

 as far as the mouth of McKay's bi-ook, where the section begins 

 which is given as No. 2, page 61 of the Report of 1869. These 

 Fish-pools beds are highly inclined and disturbed, much metauior- 

 phosed, of a bright brick red, with greenish patches and numerous 

 veins of quartz shewing siderite and specular iron. They appear to 

 dip southward where nearest to McKay's brook and opposite to the 

 dip of No 2 section, but up the river at Chisholm's culvert on 

 the I. C. R., where the colouring is not so vivid, the dip is reversed. 

 Fifty-five yards above the culvert a dyke of dark greenish felsite 

 containing spherules of quartz and zeolites runs east and west 

 At 200 yards above the culvert there is an anticline which is 

 immediately succeeded by an east and west fault, and the strata 

 then resume the northern dip until at Riverton siding the lime- 

 stone comes in with its lowest rocks dipping to the southward. 



The less altered of these beds include those of McKay's brook, 

 are seen on Finlay Cameron's farm, the next farm to the south, 

 about 150 yards west of tlie Hopewell road, and are assumed to 

 be separated from the Millstone Grit lying to the west of this 

 point \>y the extension of the great break which crosses the coal 

 field and is knoA'n as the McCuUoch's brook fault. Contact of 

 these two groups to the north of McKay's possibly takes place 

 near the line indicated on the map. The contact with the over- 

 lying Millstone Grit is well seen lower down on both banks of 

 the river, the line between them having a bearing N. 20° W., 

 the basal bed on the north bank being a grey conglomerate dip- 

 ping east 25^ with a lessening inclination. It seems hardly 



