322 GEOLOGY OF ANTIGONISH COUNTY —HONEYMAN. 
limestones in Nova Scotia’s Carboniferous having trilobites, 
Phillipsiaan of interesting Palzeozoic race, that abounded at 
Arisaig in Silurian time. To the west of these is the Archzean 
formation of the Ohio Mountains, which are common to the 
counties of Antigonish and Pictou. To the east are the lime- 
stones, sandstones, &e., of Upper South River and St. Andrew’s, 
and at Pomquet small seams of coal and sandstones, with copper 
sulphide. 
Our section terminates in a Silurian region of more than com- 
mon interest, having lakes in abundance. The chief of these are 
Lochaber Lake, Polson’s Lake and South River Lake. This is a 
water shed. The first sends its water to the Atlantic; the two 
last to Antigonish harbour. 
There are two series of rocks about those lakes: 1st—a fossi- 
liferous ; 2nd—a metalliferous. The first is on the west side of 
Lochaber Lake. It begins near the head of the lake and 
extends nearly a mile. The lower part is on the side of the 
mountain, the upper is on the side of the lake and enters it. 
The second forms an island in the lake, and passes over to the 
west side. It forms the high lands on the east side, and extends 
into the County of Guysboro’ southward. It extends eastward 
beyond South River Lake, including Polson’s Lake. It bounds 
and underlies the Carboniferous of the Section from above 
Lochaber Lake to Upper South River and beyond. The “fossi- 
liferous series” consists of equivalents of A, C’, and D, “Arisaig 
Series.” It is defective by the absence of equivalents of B, B’, 
Cand E. This was the locality where I first found A. Subse- 
quently it was found at Doctor’s Brook, Arisaig. A beautiful 
internal cast of the characteristic coral Petraia,(forrestari Salter.) 
McCoy led to the discovery. The rocks are dark brown in colour, 
and almost of flinty hardness. All the fossils in it that I have 
collected are casts, with the exception of Athyris. Ih some cases 
the caleareous part of Petraiw has been replaced by quartz. 
Fossils are by no means numerous, but those that do occur are 
characteristic. There is not the variety in lithology that we find 
at Avisaig, neither are the fossils regular in their general mode of 
occurrence. Orthis, athyris and Petraia intermingle. The 
