A Preliminary Report on the Geology of New Brunswick; Together with a Special Report on the Distribution of the "Quebec Group" in the Province (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...also occur in this neighbourhood, but while the bedded traps alternate with the clay-slates, the intrusive traps cut them at a low angle, but these intrusions, which are few in number, do SLATES AND TRAP ON TUB MASCABAN PENINSULA. 137 not appear to have exerted here much influence upon the rocks of the peninsula. Some idea of the uniformity with which the periods of disturbance and comparative repose took place, may be inferred from the following section across the strata within a space not exceeding a mile in horizontal distance. It was roughly measured along the road and obliquely to the stratification. This section is given at length in order to point out another set of disturbances which are important in their bearings upon the disposition of the mineral veins found in this neighbourhood, and the mode in which they were filled, wholly or in part. Section roughly measured along the road to the Wheal Louisiana. Here we find, in a distance of about 1,300 yards, some fifteen alternations of slates and Trap, with at least four anticlinal axes. It is probable that an exact survey would discover more alternations and perhaps more foldings; but the foregoing rough section is sufficiently near the truth to show Compare with Cape Bon Ami, near Dalbousle. J 38 HORNBLENDIC SCIIIST--DISLOCATIONS. the extraordinary disturbances to which the rocks on this part of the coast have been subjected. MINERAL CHARACTERS OF THE STRATA. The slates vary much in their composition, they are generally laminated, with even fracture, but tbey are also frequently conglomerate and porphyritic, holding pebbles and fragments of trap, and sometimes they appear to consist of consolidated volcanic ash, and they are also occasionally talcose, cloritic, and magnesian. Vast beds of hornblendic...