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Published online by Cambridge University Press: 14 March 2018
The rock-specimens here treated were collected in 1902 on a small plateau near the head of the Oberer-Bach, where the rock is in place. This stream, rising near the Röckner or Reckner, a summit of the Tarnthaler-Köpfe on the north of the Tuxerthaler mass, flows down a steep ravine southward to join the Schmirner-Bach: the locality is situated about 20 kilometres to the south-east of Innsbruck. The figures 2629 (height in metres) on the ‘Generalstabskarte’ probably represent the site of the plateau ; it is on the right bank of the stream, close to, and some 12 or 15 metres above, a small frozen lake near the head of the stream. The point was reached by ascending the ridge from the Kreuzjöchl. There was much snow on the plateau and the geological relations of this particular occurrence were not observed.
Page 366 note 1 Hussak, E., ‘Ueber einige alpine Serpentine.’ Min. Petr. Mitt. (Tschermak), 1883, vol. v, pp. 61–81 Google Scholar.
Page 366 note 2 The fact that the pinacoidal cleavage (010) of olivine is perpendicular to the optic axial plane helps to distinguish this mineral from pyroxene ; for in sections of the latter, in which the prismatic cleavage is shown as parallel cracks, the trace of the optic axial plane is parallel to-these.
Page 366 note 3 Rothpletz, A., ‘Ein geologischer Querschnitt durch die Ost-Alpen.’ Stuttgart, 1894, pp. 83, 84Google Scholar.
Page 366 note 4 von Drasche, R., ‘Ueber Serpentine und serpentinähnliche Gesteine.’ Min. Petr. Mitt. (Tschermak), 1872, Jahrg. 1871, pp. 1–12 Google Scholar.
Page 367 note 1 Lindemann, B., ‘Petrographische Studien in der Umgebung von Sterzing in Tirol.’ Neues Jahrb. Min, 1906, Beilage-Band xxii, pp. 454–554.Google Scholar
Page 368 note 1 These forms are recognized by von Drasche (loc. cit.) to be sections respectively transverse and parallel to the cleavage of the antigorite.
Page 369 note 1 Weinschenk, E., ‘Beiträgo zur Petrographie der östlichen Centralalpen speciell des Gross-Venedigerstockes.’ Abhandl. bayer. Akad. Wiss., 1895, vol. xviii, pp. 651–746 Google Scholar. (See p. 661.)
Page 369 note 2 The antigorite of the Antigorio valley diverges in optical properties still more, though in the same direction, from the mineral A, the axial angle varying from 0° to 36° (C. Klein, Sitzungsber. prouss. Akad. Wiss, 1894, p. 768.)
Tschermak gives 20° or more for the axial angle of the Spreehenstein mineral, but says (p. 255), apparently quoting Hussak, ‘die kleinste Elasticitätsaxe ist sankrecht zur Spaltobene’ —which is, perhaps, a clerical error. ( Tschermak, G., ‘Die Chloritgruppe.’ Sitzungsber. Akad. Wiss. Wien, math.-nat. Classe, 1890, vol. xcix, Abth. I, pp. 174–267 Google Scholar.)
Page 371 note 1 A. Rothpletz, loc. cit.
Page 371 note 2 Becke, F., ‘Olivinfels und Antigorit-Serpentin aus dem Stubachthal (Hohe Tauern).’ Min. Petr. Mitt. (Tschermak), 1894, vol. xiv, pp. 271-6.Google Scholar
Page 371 note 3 E. Weinschenk, loc. cit.
Page 371 note 4 Preiswerk, H., ‘Der Serpentin am Geisspfad (Oberwallis).’ Eclogae geologicae Helvetiae, 1901, vol. vii, pp. 123-5.Google Scholar
Page 372 note 1 Suess, F. E., ‘Das Gebiet der Triasfalten im Nordosten der Brennerlinie.’ Jahrb. geol. Reichsanstalt, Wien, 1894, vol. xliv, pp. 589–668 Google Scholar.
Page 372 note 2 Termier, p., ‘Les Nappes des Alpes orientales et la synthèse des Alpes.’ Bull. Soc. géol. de France, 1904, sér. 4, vol. iii, pp. 711-65Google Scholar.
