216 TRANSACTIONS OF THE [aPR. 15, 
seatteringly. This phase of the norite appears to occur as a 
heavy dyke or intrusive knob in the main mass. 
The relations of the norite to the surrounding rocks could not 
be determined. It is cut by three sets of dykes. 
1. Eurite and granite-veins, probably connected with the 
granite. 
2. Diabase. 
3. Augite-porphyrite, older than the diabase, and very much 
decayed. 
OTHER VoLtcAntc Rocks IN NEW BRUNSWICK. 
The foregoing article deais with but a small part of the vol- 
canic rocks of New Brunswick. Besides the extension of the 
Coldbrook and Kingston groups to the northeast and south- 
west, and other detached areas lying further inland, there is a 
great body of pre-Cambrian rocks, chiefly volcanic, in the 
northern part of the Province, forming a considerable part of 
the broken and unsettled country about the headwaters of the 
Tobique, Nepisiquit and Northwest Miramichi rivers. In seve- 
ral of the later formations, also, great quantities of volcanic 
material occur, notably in the Silurian of Passamaquoddy Bay, 
at the base of the Devonian around the shores of Baie Chaleur, 
in the Sub-carboniferous at the Blue Mountains near the To- 
bique River, around the head of Grand Lake and elsewhere, and in 
the Triassic at Quaco and Grand Manan Island. No petrographic 
study of any of these rocks has yet been made, and they afford 
a fruitful field for future investigation. The great areas of De- 
vonian granites extending across the centre of the Province 
from the southwest nearly to the northeast boundary would 
also well repay study, especially with regard to their well 
marked contact phenomena. 
SUMMARY. 
The Huronian in Southern New Brunswick is in large part 
made up of surface volcanic rocks. The lower part or Cold- 
brook group is almost exclusively voleanic; the upper part or 
Etcheminian is clastic, while the intermediate Coastal contains 
both volcanic and sedimentary members. The effusive rocks 
include lavas, breccias and tufts, and with them may be placed a 
holocrystalline soda-granite which is probably either an in- 
trusion or a very thick surface flow. 
The rock types represented may be conveniently divided into 
acid and basic, the intermediate varieties being little developed. 
The acid rocks are more abundant. They are chiefly felsite-por- 
phyry and show all the characteristic structures of surface 
