260 Prof. Milne and Alex. Mvrray — Roch of Newfoundland. 
clegradation have washed away porticrns of tliese rocks and divided 
them in patches ; whilst metamorphic action lias so ckanged tkeir 
character that at times they are hardly to be recognized. 
Sillery (St. Julien Sandstones, etc.) 1 — Above tbe serpentinous and 
Maguesian series, whicb bas been estimated by Mr. Murray as having 
a tbickness of from 16 to 1700 feet, tkere is a large series, chiefly 
composed of black slates and limestones, approximately 3 to 4000 
feet in tbickness. In these slates, wbicb are well exposed in the 
nortbern parts of tbe island, I bave observed botb intrusive and 
imbedded masses of diorite. Tbey are generally of a dark grey or 
greyisb green colour, and in some cases amygdaloidal, tbe amygdules 
being filled witb calcite. Under tbe xnicroscope, altered felspar, 
bornblende and grains of magnetite are generally to be seen. 
In Noddy Bay tbese sbales are serpentinous, and contain im- 
bedded nodular masses, wbicb under tbe inicroscope resolve tbem- 
selves into a serpentinized diorite. True Serpentine is also to be met 
witb in the same locality. Tbe intrusive rocks of tbis district would 
show that the volcanic action continued after tbe deposition of tbe 
upper part of tbe Quebec Group. 
Niagara and Clinton. 2 — The only display of tbese rocks wbicb bas 
been hitherto recognized is to be found at the bead of White Bay, 
wbere we bave a series of conglomerate, and slates capped witb 
Limestone, altogether 2800 feet in tbickness. Owing to the oc- 
currence of a series of faults, some of wbicb may araount to 1000 
feet, there bas been difficultj- in tracing out tlie sequence amongst 
the members of tbis formation. Traversing tbese rocks tbere are 
several large dvkes of melaphyre and felsite. One of tbese latter, 
at tbe S.W. end of Sops Island, appears in columnar masses 40 — 60 
feet in beight. Tbey are of a pinkish colour, and have a splintery 
coarse fracture. Their measurements are about 1 foot in diameter, 
and 20 feet in length. They bave generally from 4 to 6 sides. 
In places they are curved and sliglitly divergent. Tbe tops of these 
prismatic-like eolumns form acute angles with the sides, instead of 
being at right angles, as is so generally tbe case. Between tbese 
eolumns strips of greenstone, whicb under tbe microscope resolves 
itself into a melaphyre, may be seen. Tbese felsites are also to 
be seen further to tlie north. 
On tbe S.E. side of tbe island there is a large dyke, wbicb also 
appears to be a melaphyre, and probably derived from tbe alteration 
of a dolerite. It contains many veins of calcite and quartz, and 
along one side of it a very fair deposit of galena. 
1 In the note on page 256 I have already expressed my views regarding the strati- 
graphieal position of tliese sandstones. 1 have visited St. Juliens myself, and Mr. James 
Richardson. of the Geological Survey of Canada, visited tlie place where the formation 
is largely displayed, at the north-eastern termination of the island ; but a contact with 
the serpentinous group was not seen in either case ; and I hold to the opinion that it 
is in consequence of tlie later group being unconformably spread over the older rocks, 
that the sandstones are not seen at ilow Harbour or at Pistolet Bay. — A.M. 
2 Rocks of Middle Silurian age have already been referred to, as having a wide 
spread in Exploits Bay and the Southern parts of Notre Dame Bay. The lithological 
characters, and some few obscure fossils, also seem to indicate that the series, or a 
Portion of it, extends far up the Exploits and the Gander Rivers. — A.M. 
