Prof. Milne and Alex. Murray — Rocks of Newfoundland. 253 
in the Northern, Southern, and Central parts of the island we have 
a great display of these rocks, consisting of granite, Syenites, 
gneiss, etc., together with niany igneous dykes, sorae of which are 
of considerable breadth. From several of these dykes I collected 
specimens. One of these from Harbour Deep averages at least 25 
yards in width. It cuts through a hornblendic gneiss which is 
traversed by many small veins of quartz, associated with which 
are small specks of copper pyrites, especially in the vicinity of the 
dyke. The rock of which the dyke is composed is a melaphyre of a 
bluish-green to a black colour, and lias a splintery fracture. A 
specimen from one side of the dyke shows some calcite and a little 
quartz ; a specimen from the opposite side is more compact, and is 
almost an aphanite. Specimens taken from the inner parts of the 
dyke were not so compact as those from the exterior, and were of a 
greyer colour. Crystals of a plagioclase felspar, magnetite, and also 
a considerable amount of apatite, which latter was not seen in the 
exterior portion of the dyke, are easily recognized. On going to 
another portion of the dyke, three-quarters of a mile to the south, 
and taking a similar series of specimens across its breadth, I found 
that the exterior portions of the dyke had a more slaty character, 
and the central part, although it still contained the apatite, also con- 
tained quartz, which had not been before observed. This particular 
dyke therefore illustrates that not only may there be differences at 
diiferent points across the breadth of a dyke, a result which has 
often before been observed, but also that we may meet with 
differences as we work along their length. 
In the vicinity of St. George’s Bay there is a series of labradorite 
rocks which Mr. Murray has recognized as belonging to the Upper 
Laurentian. I have also seen specimens of labradorite from High 
Point, Biver Exploits, but I do not know how it occurs. 1 
Intermediate Series . 2 — The first series we meet with above the 
Laurentian is a series which is supposed to be the equivalent of the 
Cambrian and Huronian, to which it has a great lithological re- 
exist to a partial extent in the valley of the great Cordroy River. About thirty miles 
up that valley I found large angular fragments of white crystalline limestone, with 
graphite, which exactly resembled the Canadian rocks; and in front of the position 
they were supposed to occupy the hills are composed of labradorite, which 1 assume 
to be of Upper Laurentian age. — A.M. 
1 These are in erratic blocks, more or less water-worn; their source is not 
known. — A.M. 
2 I object to the term Cambrian, as applied to Huronian, and I introduced the 
name Intermediate, because the System is undoubtedly intermediate between the 
Laurentian and the lowest beds of Primordial strata, holaing Paradoxidee, Agraulus, 
Archeeocyathus, Iphidea, Agnostus, Conocephalites, Obolella, and many other forms 
typical of the lowest Palaeozoic fauna. I have shown that the Intermediate or 
Huronian System, must have been worn through by denudation to the very base, 
previous to the deposition of the heds holding the above-named fauna ; as we find 
them occurring nearly undisturbed overlapping the Laurentian and lower heds of the 
Huronian. I pointed my evidences out to my old friend and colleague, Sir William 
Logan, on the ground, who was immediately convinced of the accuracy of my obser- 
vations. 1 have also shown that there are some striking lithological rcsemblances 
between the Intermediate of Newfoundland and the typical Huronian of Canada. — 
A.M. 
