H0IS'ET:MAN — on the geology of NOYA SCOTIA. 73 



southerly, they would appear to have their centre east of McDon- 

 ald's mountain, near the place where I met with the strata at first 

 on entering the river. 



The lower Helderberg outcrops that I have described in this 

 quarter, appear to lie on the sides of a triangle, whose apex is 

 opposite McDonald's mountain, which has the course of the river 

 for one side, the continuation of the outcrop on the road, and the 

 mountain strata for the other side, and the strata at McBeath's 

 for the base, and Clinton strata situate in part of the area. This 

 seems to show that there had once been a mesial fold in this area, 

 that the crowning Helderberg had been removed by denudation, 

 and that the underlying Clinton strata had been exposed as we now 

 find them. I examined for a considerable distance to the south of 

 the supposed apex, and found silurian strata outcropping all along, 

 until I reached the site of Mcintosh's saw mill. In this direction 

 all the strata are metamorphic. The outcrop at the mill, forming a 

 fine fall, appears to be of Medina strata. Descending the river, I 

 reached metamorphic Clinton strata in the river and on the east 

 bank of it, having abundance of veins of quartz, — one of the re- 

 puted gold fields that I have already referred to. This is evi- 

 dently a continuation of the metamorphic strata which I have 

 just noticed as underlying the lower Helderberg strata of the 

 mountain. 



I have yet to connect the lower Helderberg strata at McBeath's 

 with the Clinton of French River, where it crosses the road between 

 New Glasgow and Antigonishe, and to lay down the order of for- 

 mation at the mouth of Marshy Hope, and draw the silurian boun- 

 dary line from Mill Brook to the Marshy Hope, in order to com- 

 plete the line between McNeil's brook, Arisaig, and McDonald's 

 brook, East Branch, East Kiver, and survey several important 

 areas included within these boundaries, before I can map out satis- 

 factorily the silurian systems of Antigonishe and Pictou. 



It may seem strange that during my description of the area un- 

 derlying the Pictou Coal Field, I have made no mention of the 

 Devonian formation which is so often spoJcen of in connection with 

 the strjita underlying this coal field. The reason why is this ; there 

 is no Devonian to he found there* 



