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BULLETIN OF THE NATURAL HISTORY SOCIETY. 
the Kingston terrane on its south side, where it comes in contact 
with the Laurentian. In Charlotte County the great mass of 
the Kingston series, 10,000 feet thick, may be seen dipping 
towards the Laurentian rocks, but never transgressing this sharp 
dividing line. Hence, we conclude that this was an old fault 
line where these igneous effusions found vent, and that as fast 
as the Huronian lava and ashes were poured out they were de- 
posited on a sinking land north of the fault, while the earth's 
crust south of this line continued to rise, preserving the emerged 
Laurentian land. Any lava and ashes that may have been 
thrown out on the south side of the fault have been eroded and 
removed ages ago, owing to the frequent elevation of the land 
in the area on that side, where now the Laurentian rocks are 
exposed. 
Following the deposition of the Huronian rocks there must 
have been elevation and a period of denudation before the depo- 
sition of the Palaeozoic sediments, for these lie in valleys worn 
in the softer parts of the Huronian; such a valley is that occupied 
by the Long Reach of the St. John River and Belleisle Bay 
and others farther west. 
In all this region throughout Huronian and most of Palae- 
ozoic time w T e find no great limestone deposits such as belong 
to the Laurentian below; the next important limestones are 
those at the base of the Carboniferous system, which are easily 
recognized by their organic remains. No such fossiliferous land- 
marks are known in the Huronian strata, so that, in determining 
the age of these, we have to rely on their stratigraphical relations 
to adjoining Laurentian or Palaeozoic masses of rock; and from 
their relation to the Laurentian on one side and the Cambrian 
on the other, we conclude that the rocks described above should 
be referred to the Huronian System. 
The system of rocks in Nova Scotia which we would parallel 
with the Huronian of New Brunswick is the Maguma or gold- 
bearing series of the Atlantic coast. As seen in the eastern half 
of the peninsula of Nova Scotia, the lithological appearance is 
in strong contrast with the Huronian on the north side of the 
Bay of Fundy; but Professor Bailey, in tracing the gold-bearing 
