OMe ag 2 Se 
as. if oy : Fe le 
— «66 Dro’, x. Jackson on the. Pee 
- Point is parallel with that on the borders of the Bay of Fundy 
in Nova Scotia, and it will be further noticed on examination of _ 
the geology of these distant regions, the conditions of the rocks 
are similar, if not identical. The trap of Nova Scotia, like that 
n Lake Superior, protrudes from below the red sandstone, sup- 
posed to be the new red, and passes between the strata in the line — = 
of least resistance. Amyedaloid, with species of minerals simi- 
lar to those of Lake Superior, excepting Prehnite, which is rarely — 
found in Nova Scotia, exist also at the line of junction of the © ey 
trap rocks and sandstones of Nova Scotia. Native copper occurs 
in the che deton of Lake tai Heulandite is rare in the 
ke Superior trap rocks, while it is extremely abundant in Nova 
Scotia, but the other minerals are of the same species in both 
laces. 
It will be observed on examination of the geological maps, that 
the same gentle crescentic curving of the trap bands towards the 
northwest was noticed in both countries, a fact also recorded by 
Dr. Percival and Prof. Rogers, in their reports on the geology of 
Connecticut and New Jersey. 
eneral geological laws seem to have prevailed in all the re- 
gions where trap rocks have burst through sandstone, the effeets 
of heat being recognizable, and proportional to the relative mass- 
es of intruded rocks. 
It cannot fail to 7 every geologist familiar with rocks of 
igneous origin, and their effects on sedimentary strata, that the 
history of the origin of ve rocks is indelibly recorded, and that 
they are really lavas that have risen from the interior of the globe 
through fractures in its crust, taking the line of least resistance 
by passing between the strata, 
By the influence of heat the sedimentary strata were interfused 
with the igneous rocks, and it is a singular fact that amygdaloid 
is most abundantly produced by the action of trap rocks on sand- 
stone, and that copper is the most usual metal found in the fis- 
sures, amygdules, and pockets of the resulting amygdaloid. 
True workable veins of native copper in this class of rocks had 
not been described, so far as I know, anterior to my researches on 
Lake Superior, and it was regarded as contrary to all experience 
that this metal should thus occur in quantities sufficient for prof- 
itable mining. The only locality where native copper has been 
mined to any extent, is in Siberia, but the metal is not in trap. 
Having satisfied myself of the fact that adequate quantities of 
the metal did exist in veins in the amygdaloid trap of Lake Su- 
perior, I ventured to recommend the opening of mines on Ke- 
weenaw Point, on and near Eagle River, and the result has proved 
that native copper veins can be profitably wrought. I mention 
