HONEYMAN — ON THE GEOLOGY OF NOVA SCOTIA. 65 



the place where the limestone re-crosses the river. Here I find 

 them overlying metamorphic argillites, without any other rock in- 

 tervening. These have all the appearance of lower Helderberg 

 argillites, much altered. I found no fossils in them. Their cleav- 

 age joints glistened with micaceous iron ore. 



These limestones extend to the bank at widow Chisholm's and dis- 

 appear. The last outcrop of limestone occurs about a mile farther 

 up the river, and above the road. This appears to be the extreme of 

 the carboniferous formation in this direction. The band of silurian 

 strata which underlies the limestone below Chisholm's, is underlaid 

 by greenstone. The line of contact is cut by the road that leads 

 from the Presbyterian church to the Blue Mountain. The green- 

 stone is very long and wide. I do not know its boundaries. It 

 extends up the river to the rear of the last outcrop of limestone i. 

 This greenstone belongs to an apparent monoclinal series. Farther 

 up the river, at McPhee's, I found another outcrop of strata with, 

 greenstone. This may be called anticlinal No. 3. From this the- 

 silurian area becomes divided and bifurcates ; one branch being what. 

 I have traversed on the one side of the river, and the other extend- 

 ir'^ on the opposite side; the two being separated by the narrow 

 lower carboniferous area, to which the limestones that I have already 

 noticed belong. 



I examined the skirts of the silurian formation on this the south 

 side of the river. I found the first outcrop in the bed of the riiv.r, 

 south of McPhee's. The strata exposed consists of black shale^ 

 which appear to be near the lowest part of the Clinton equivalent of* 

 Arisaig. Farther west the same strata are exposed in a brook at ih.e 

 dam of a saw-mill. Farther west they are again exposed in a brook:, 

 at Pleasant Valley, with an underlying band of lighter colour andJ 

 greater solidity, which appears to resemble the Medina sandstone; 

 equivalent of Arisaig. Still farther west we reach McDonald^s 

 brook, to which I have already called special attention. This- is:; 

 opposite the green marble, which I referred to as connected witliLs 

 anticlinal No. 2. In this brook there is a great exposure of tha? 

 Btrata under examination^ and in ad^tion to these a series forming; 

 an anticlinal, which extends: to the distance of two hundred and fifty ^ 

 paces from the river,, making the greatest possible breadth of the 

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