1870.] HIND—GNUISSOID SERIES OF NOVA SCOTIA. 477 
which in New Brunswick and Nova Scotia preserve a remarkable 
parallelism. These corrugations, in the descriptions of the structure 
of the Nova-Scotian gold: districts, are termed the east and west 
anticlinals*. 
VI. Rararton oF tur Gorp-Disrricts ro ran Gneisstc ARUAS. 
The north and south anticlinals are low broad undulations which 
have ridged the country (Nova Scotia) in a nearly meridional course. 
At the intersection of the north and south with the cast and west 
anticlinals, the gold-districts of Nova Scotia are situated; and it is 
here also that denudation has occasionally exposed the gneissic rocks 
in patches, like islands in a Silurian sea. 
The map of the gneissic rocks in the county of Guysborough, 
Nova Scotia (fig. 4), is an illustration of this form of outcrop; and 
the map showing the Silurian valley between Halifax and Windsor 
(the Atlantic and the Bay of Fundy) exhibits the protecting influ- 
ence of the north and south synclinals (fg. 1). 
Where islands of gneiss occur in Nova Scotia, the gold-districts 
are symmetrically arranged around them—the outcrop of the lodes 
(which are beds of quartz) having a semielliptical form, the base of 
the ellipse resting on the gneiss. 
Where they occur in a Silurian valley, between great exposures of 
gneiss, as represented on the map showing the structure from Halifax 
to Windsor (jig. 1), the exposed edges of the beds of quartz have 
also a semielliptical form; and if two districts are situated on 
opposite sides of the valley, the apices of the semiellipses point 
towards each other, their bases resting on the gneiss, as in the case 
of Waverley and Mount Uniacke. 
Where denudation has not reached the gneiss, the outcrop of the 
bedded lodes may have any of the symmetrical forms which can be 
produced by the intersection of plane and curved surfaces. 
From the uniform distribution of the auriferous beds of quartz in 
the Silurian rocks of Nova Scotia, we may expect to find accessible 
deposits at the intersection of the anticlinals all over the Province, 
where they are not concealed by superior formations; and since 
denudation has taken place to the greatest extent near gneissic 
areas, it may be anticipated that the correct mapping of these rocks 
will be of considerable economic advantage to the Province. 
Recent operations in the gold-district of Waverley have afforded 
very satisfactory proofs of the contemporaneous bedded structure of 
“many of the Nova-Scotian lodes, and also of the general structure 
assigned to the districts, and of their occurrence at the intersection 
of cross anticlinals as well shown in the case of the recovered Tudor 
and North Lodes at Waverley, and in the districts of Waverley and 
Sherbrooke generally, which are types of all the known gold-districts 
of Nova Scotia. 
These proofs are thus referred to by the Chicf Commissioner of 
* See ‘Reports on the Waverley and Skerkrcoke Gold-Districts, by the 
Author. 
