File:The Quarterly journal of the Geological Society of London (13936959322).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13936959322).jpg |
84 PEOF. T. G. BONNET ON TWO TEAVEBSES OF THE over the crystalline rocks of the central range, from which, however, they have been almost entirely removed by denudation. Of the igneous rocks of the region, especially those of the Southern Tyrol, it is needless to speak. The above-named " Thonschiefer" with the lower part of which some chloritic schists and crystalline limestones are associated, is extensively developed in the Eastern Alps. The name " Thonschiefer " is vague ; for, if I mistake not, it might be applied to either a claj^-slate or an aluminous schist. Certainly the rock is not the former, though sometimes locally, when greatly crushed, it presents a stroug resemblance to it. In the extensive rock-collec- tion of the Innsbruck Museum the series is called " Thon-glimmer- Schiefer" which is made less ambiguous by the inserted word. I have a difficulty in finding an English equivalent. Clay -mica- schist is misleading, aluminous mica-schist awkward ; upper mica- schist is open to objection as involving an assumption as to strati- graphy ; phyllite suggests too fine-grained a rock ; so I propose, at present, in the poverty of English nomenclature, to retain the German term " Thonglimmerschiefer." (/3) The Pusterthal and Neighbourhood. "We travelled by railway up the valley of the Adige, traversed the igneous rocks in the neighbourhood of Bozen, and in due course reached the " Thonglimmerschiefer " south of Klausen *. With the members of this group previous visits to the Tyrol had already made me fairly familiar, and I could see, even as I passed by, that though they varied somewhat in texture and hardness, the dominant rock is a moderately soft, dull lead-coloured mica-schist, in which the individual films are not coDspicuous to the eye, at any rate at the first glance. This obscuration of the true structure is very probably the result of crushing. The apparent foliation is a cleavage-foliation the conspicuous surfaces are " sheen surfaces," which exhibit a peculiar gloss, looking sometimes like the polished black-lead of a fire-grate. These macroscopic characteristics are very commonly so general and so uniform, that one can recognize the rock with certainty even from a railway-train f. Our first halt was made at Brunecken, where. the " Thonglimmerschiefer" series is well exposed close to the town, and presents some interesting variations. The picturesque old castle stands on a craggy mound of white crystalline limestone (Appendix, p. 107) ; this, on the southern side, is distinctly " bedded " like an ordinary limestone, and dark streaks occur in the rock parallel with this structure. The beds are much twisted about, but they appear to have a general strike about S.S.E., with a high dip. On the northern side a little mica-schist crops out, apparently in situ ; but its strike is nearer E.S.E. Then comes (after a short In several places, as I have myself seen and have learnt from the Innsbruck Museum, the dolomites of the Italian Tyrol rest on either " Thonglimmer- schiefer^ or mica- schist. t I have verified this assertion manytimes. |
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Source | https://www.flickr.com/photos/biodivlibrary/13936959322 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36939865 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 82 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36939865 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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