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III.—On a Pebbly Quartz-Schist from the Val d'Anniviers (Pennine Alps)
Published online by Cambridge University Press: 01 May 2009
Extract
IN 1893 I described in this Magazine a group of quartz-schists which may be traced for many miles along the Alps—a group belonging to the series which appear to be the newest among the crystalline schists of that chain. I may refer to this paper for a description of their mode of occurrence, distribution, and structure, both macroscopic and microscopic, merely stating that, while considering them to have had a clastic origin—in other words, to be metamorphosed sandstones—I pointed out that they presented some material differences from ordinary quartzites, and that “original fragments [could not] be distinguished with certainty in any of them,” though “here and there a clastic structure,” of which I gave instances, “may be suspected.”
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References
page 400 note 1 Geol. Mag., Dec. III, Vol. X, pp. 204–210.Google Scholar
page 400 note 2 It is the second valley to the west of the Vispthal, opening into the Rhône Valley opposite to Sierre.
page 401 note 1 An old mule path cuts off some of the zigzags of the carriage road. I have traversed both routes.
page 402 note 1 It is called Glanz Schiefer (schistes lustrés) on Blatt xvii, and Graue Schiefer, kalkhaltig, on Blatt xxii. On the former its place in the table of colours seems to make it newer than the Carboniferous, but on the latter it is the older rock. So far as regards the calcareous and micaceous schists which are associated with the quartz-schist, I have no doubt that the whole group is pre-Carboniferous; but the other map appears to me to designate by the same tint two rocks which differ in locality, lithological characters, and geological age.
page 402 note 2 I intended to make an exact measurement as I came down the valley, but was hurried by the on-coming of a heavy shower.
page 402 note 3 I have not examined this part, so cannot say whether the quartz-schist is absent or the outcrop is too thin to be indicated on the map.