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II.—On the Sand-grains in Micaceous Gneiss from the St. Gothard Tunnel; and on some other Difficulties raised By Prof. Bonney

Published online by Cambridge University Press:  01 May 2009

F. M. Stapff
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Extract

From the “Annals of British Geology,” 1892, No. 533, p.294, I find that Prof. T. Bonney doubts the occurrence of sandgrains in the Guspis micaceous gneiss, as stated by me in various reports on the geology of the St. Gothard Tunnel, and repeated on p. 17 of my “Remarks on Prof. Bonney's paper on the Crystalline Schists and their relation to the Mesozoic rocks in the Lepontine Alps.” The question being of some general interest, and not only of importance for the comprehension and classification of the crystalline schists in the Lepontine Alps, I think it desirable to repeat here the observed facts, and to present to the notice of the readers of the Geological Magazine some autotype prints of the rockinquestion. I am the only geologist who has seen these bedsinsitu, when they were opened by the St. Gothard Tunnel; and it would be rather difficult for anyone to make out their outcrops along the line of profile through the Guspis Valley and below the actual moraine of the St. Anna glacier, without taking into consideration the faults and thrusts in this tract, which are indicated on my geological map of the St. Gothard Railway and on the profile of the tunnel.

Type
Original Articles
Information
Geological Magazine , Volume 1 , Issue 4 , April 1894 , pp. 152 - 160
Copyright
Copyright © Cambridge University Press 1894

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References

page 152 note 1 See Correspondence, GEOL. MAG. 1892, p. 90.Google Scholar

page 152 note 2 Geological Magazine, 01, 1892, 12 III. Vol. IX. pp. 6–21.Google Scholar

page 157 note 1 Mentioned in the translation from the Geol. Durchschnitte und Tabellen.

page 159 note 1 Reproduced by ProfessorBlake, J. F.,inhis Annals of Geology for 1892, p. 293Google Scholar

page 160 note 1 My “grey garnet schists” (sint ProfBonney's, Piora schists) are reckoned from 90–1142 m.;Google Scholar my “black and green garnet mica schists” from 1142–1833 m.(Geological Magazine, loc. cit. p. 9).Google Scholar

page 160 note 2 Sint ProfBonney's, “Piora schists.”Google Scholar

page 160 3 In the GEOLOGICAL MAGAZINE (loc. cit. p. 19) I have freely confessed that the reference to Archæan was a mistake of mine.Google Scholar