﻿Frof. Milne and Alex. Murray — Rochs of Newfoundland. 253 



in the Northern, Southern, and Central parts of the island we have 

 a great display of these rocks, consisting of granite, sj'enites, 

 gneiss, etc., together with many igneous dykes, some 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 has 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 

 different 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, Kiver Exploits, but I do not know how it occurs.' 



Intermediate Series.- — 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. 



* 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, holding Faradoxiden, Agraulus, 

 jirchceocyathus, Iphidea, Agnostiis, Conoce2}halites, Obolella, and many other forms 

 typical of the lowest Palaeozoic fauna. I have shown that the Intermediate or 

 ■ Buronian system, must have been worn through by denudation to the very base, 

 previous to the deposition of the beds holding the above-named fauna ; as we find 

 them occurring nearly undisturbed overlapping the Laurentian and lower beds 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. I have also shown that there are some striking lithological resemblances 

 between the Intermediate of Newfoundland and the typical Huronian of Canada. — 

 A.M. 



