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IV.—On the Pre-Cambrian Rocks of West and Central Ross-shire
Published online by Cambridge University Press: 01 May 2009
Extract
In these mountains to the north of the road leading from Glen Docherty to Auchnasheen, the gneiss rocks and mica schists of which they are mainly composed dip at a high angle, and have a strike averaging somewhere about N.W. to S.E.—in some places being nearly due N. and S., in others only a little N. of W. This strike, which is the normal one for the Pre-Cambrian rocks, and very unusual in the newer deposits, occurring here throughout so great a thickness of strata and over a wide area, when we take into consideration the fact also that the rocks themselves present the strongest resemblance possible to many of those found amongst the Pre-Cambrian rocks in the Western areas, furnishes very strong proof that we have here a re-appearance of the old Pre-Cambrian floor.
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References
page 267 note 1 Professor Bonney in his paper (Quart. Journ. Geol. Soc. vol. xxxvi. p. 105) says that he “failed to find any hornblendic rock other than intrusive” in Ben Fin. That Nos. 9 and 10 are not intrusive is in my opinion (as also in Mr. Davies's) almost beyond doubt, and I am surprised that Prof. Bonney did not meet with them, especially as he appears to have come across, at an horizon near where these are found, what he calls a “garnetiferous diorite.” That, however, he should not have touched all the varieties in his hurried examination of a few hours is not at all surprising, considering that I spent two whole days on these mountains, and had even then to miss many points.Google Scholar
page 270 note 1 Microscopical Petrography, F. Zirkel, p. 24.