File:The Quarterly journal of the Geological Society of London (13936980211).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13936980211).jpg |
90 PROF. T. G. BONNET ON TWO TEA VERSES OF THE the range. These rocks have a marked resemblance to the " Lepon- tine gneiss " of the Central Alps. I wrote in my diary : — " The rocks seen at the head of the Gschlossthal vary in aspect from the i Antigorio ' gneiss through the Monte Leone gneiss to that of the pass of St. Gothard, but I have seen nothing which resembles the Tremola schists." The strong-banded, micaceous and hornblendic gneisses mentioned above are traversed on the ascent to the Yelber-Tauern pass. My observations of the foliation, which is often associated with mineral banding, give strikes varying from E.N.E. to E.S.E., with a moderate dip, say about 25°, on the southern side ; but there are frequent indications of rolling and twisting, for higher up the dips vary from the southern to the northern side, and north-westerly strikes seem to predominate. As we approach the crest of the pass the beds are more coarsely crystalline and may be true granites ; they show a certain foliation, but not mineral banding. On the upper part of the descent towards the north we meet with a considerable amount of hornblendic rock (HornblendescMefer, V. II.), sometimes dark, some- times spotted with white felspar (?), occasionally rather coarse, slightly foliated or now and then even banded, varying from massive to rather platy in structure, on the whole very like some of the horn- blende-rock in the Hebridean series. Very much, if not all, may be modified igneous rock, which hypothesis is confirmed by the outlines of the outcrops indicated on the map. Some distance from the top of the pass we noticed that, in the crags on the left bank of the upland glen which we were descending, masses of rock, probably from 50 feet to about 300 feet thick, exhibited a kind of stratification, indicated by differences of tint, and these dipped clearly northwards, at perhaps an average angle of 40°. Beyond this the bed of the glen is interrupted by a range of cliffs. The bottom of the slope is reached by a rapid and rough descent in a north-westerly direction, during which we ob- served that the mica now and then became more silvery, and the rock, as a whole, assumed a less " ancient " aspect. On reaching the bottom the scenery changes, the stream becoming bordered by sloping pastures and copses, and no rock was seen in situ till after passing the Pinzgauer Tauernhaus (3,5-30 feet), when a rather fissile chloritic schist crops out. Hence to near Mittersill little rock is seen, what there is being either the normal chloritic schist or green rock of a not very definite character. The lateral torrents, however, bring down blocks of fine-grained rather banded gneisses, darker and lighter, of various gneisses and schists approaching the Lepontine type, with some which appear to belong to the "Thonglimmerschiefer" series ; but shortly before reaching Mittersill we traverse in a shallow gorge a considerable mass of chloritic schist, with a high dip towards the north (Appendix, p. 108). It is somewhat calcareous, and corre- sponds with the green schists in the glen north of Windisch-Matrei. According to Yon Hauer's map the associated group of calcareous, micaceous, and chloritic schists extends continuously round the eastern edge of the Central- Gneiss massif, passing from Windisch- Matrei, by the head of the Mollthal, to the valley of the Salza, in which, among level water-meadows, Mittersill issituated. |
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Source | https://www.flickr.com/photos/biodivlibrary/13936980211 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36939871 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 88 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36939871 | ||
Page type InfoField | Text | ||
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Flickr tags InfoField |
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Flickr posted date InfoField | 21 April 2014 | ||
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26 August 2015
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current | 05:55, 26 August 2015 | 1,182 × 2,101 (437 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13936980211 | description = 90 PROF. T. G. BONNET ON TWO TEA VERSES OF... |
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