258 Prof. Milne and Alex. Murray — Rocks of Newfoundland. 
to be seen, wliilst magnetic iron, and probably also chromic iron, are 
disseminated tbrough the mass. Enstatite, diallage, and bronzite 
have also been observed. 
The chloritic rocks are sometimes slaty in their cbaracter, and 
sometimes compact and eartby. Very often these rocks are talcose, 
and in their joints calcareous. Grains of magnetite ave to be seen in 
the mass. Some of them give indications of having been derived 
from diorites. Associated with this series are a number of rocks 
which are also, but to a much less degree, chloritic. Amongst them 
we have altered felsites of a liglxt-green colour, some of which show 
changes approaching Serpentine. There are also others of a green 
colour, which are tolerably compact, but which under the microscope 
apparently resolve themselves into a volcanic ash or breccia. In 
some cases the angular and sub-angular fragments of which these 
rocks are made up are easily to be recognized. Distinct traces of 
crystals of felspar are also to be made out. 
Amongst these rocks, bands or beds of dolomite are occasionally 
found, associated with which at Tilt Cove there is an irregulär 
deposit of copper-nickel. It is in the form of small strings and 
nests. With the chloritic rocks irregulär deposits of copper pyrites 
occur ; this has led, in the case of Tilt Cove, to the opening of a 
large and prosperous mine. 
Furth er to the north, at Terra Nova Mine, a similar series of 
rocks is to be met with. Here the predominating metallic ore is 
iron pyrites, which occurs in a band about five feet in thickness. 
Although sedimentary rocks are exhibited in the district, volcanic 
rocks nevertheless predominate and give a cbaracter to the whole. 
That in Silurian times we had volcanos of large extent may alone be 
inferred from the existence of the extensive beds which I have 
called volcanic ash and breccia. Since that period, however, the 
rocks have been so changed in cbaracter that it is with difficultv, 
and generally speaking ouly with the aid of the microscope, that their 
origin is to be inferred. 
Along the north side of Hare Bay we find a compact splintery 
grey slate, which at many points holds finely disseminated iron 
pyrites, which is also sometimes in veins. Near the head of the 
Bay, at How Harbour, true serpentinous rocks rise conspicuously into 
high liills, which have generally a bare appearance and a character- 
istic reddish tinge. Some specimens from this locality had a splintery 
fracture and a fibrous structure. With the f objective, kaolinized 
felspar, crystalline grains of hornblende and crystals of magnetic 
iron were distinctly visible, giving altogether indications of an 
altered diorite. Other specimens sliowed a striking likeness to some 
of those from Gander River Valley, 160 miles to the south. 
On the western side of the island, commencing at Bonne Bay, are 
some very high flat-topped hills, which, from their reddish colour 
and bare surfaces, are at once to be recognized as being serpentinous. 
To the south of this, in Lark Harbour, we find rocks belonging to 
this series of a very undefinable cbaracter, — they are rusty, ar- 
gillaceous, and filled with so many joints that it is difficult to obtain 
