Huronian Seriegin.. Nowa Stotiti a. 
Porphyritic varieties, which often form mountain masses, some- 
times have, at first sight, but little the aspect of stratified rocks, 
and might be mistaken for intrusive granites,” * 
_ Serpentines in the Arisaig district of Nova Scotia is of 
4 nce, an 
which will ultimately establish the correctness of my supposition 
ee 
t 
} 1 Cape Breton Island I saw in 1866 the black corrugated 
slates forming the summit of the gold-bearing series in Nova 
®oast; and on the Mackenzie river, near Red Cape, I crossed 
Or a great gneissoid series. ‘eg ; 
Th other parts of Cape Breton I have seen similar gneisses as, 
for Instance, near the mouth of North river, St. Ann’s Bay, and 
90 the peninsula opposite Baddeck. 
Pee OO “RS > eae Se 
those of Nova Scotia. Hence it becomes more than probable 
that a rg portion of the area colored by Dr. Dawson to 
pper Silurian i | 
* Page 587, Geology of Canada, 1863. 
_t Page 11, Preliminary Report on a Gneissoid Series in Nova Scotia, by the author. 
