66 HONEYMAN — ON THE GEOLOGY OF NOVA SCOTIA. 



intervening carboniferous band very narrow. In this side of the 

 anticlinal, I found strata containing Clinton fossils, which en- 

 abled me to determine the equivalency of the corresponding strata 

 on the south side of the anticlinal, which include the specular iron 

 ore at McDonald's. By this discovery, I was enabled to establish 

 a geological connection between this ore of iron and the fossilifer- 

 ous iron ore at Blanchard, and the limonite (iron ore) of Spring- 

 ville. In the axis of this anticlinal I observed a mass of green- 

 stone on the left of the road which leads to McDonald's. These 

 strata are farther exposed on the side of another brook below 

 Archibald's. From the green marble the carboniferous area 

 ^widens and expands as it proceeds westward ; the silurian proceed- 

 ing westward until we find it cut by the Pictou and Truro railway, 

 I)y which the fine section of the strata is formed, which I have al- 

 ready compared with sections of the strata of the Gold Fields. — 

 Yide Part preceding. 



Returning to Springville, I proceed to describe my operations 

 mn extending farther the knowledge of the geology of this district. 

 At McLean's I found the limestone separated from the lower Hel- 

 ^erberg, by a band of lower carboniferous shale. This occupying 

 the position which I have found limestone occupying in Holmes's 

 brook ; in the river at McPhee's, Springville ; and in the river at 

 CJhisholra's, Pleasant Valley. This shews that clay was being de- 

 posited, as one might expect, on upper silurian strata ; while lime- 

 stone was being at the same time formed upon the same kind of 

 strata ; so that the two must be regarded as contemporaneous. I suc- 

 <;eeded in extending the lower Helderberg to the north of McLean's, 

 as far as the extremity of Irish Mountain. I found fossils of this 

 horizon at McMillan's, and near McKenzie's, in situ. At the foot 

 of Irish Mountain, at McMillan's, I found the lower Helderberg 

 overlaid by lower carboniferous conglomerate. This outcrops in 

 the drain on the side of the main road, and in the little stream be- 

 low McMillan's. On the back of Irish Mountain I found fossils 

 in situ, but not very distinct ; and in Cross Brook, behind it, I 

 found Clinton strata, with characteristic fossils. I followed these 

 down the brook, where I found them extending to the north of 

 Irish Mountain and its lawer Helderberg, resting on the green- 



