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Reviews.

Crystalline Rocks from the Andes.

Untersuchungen an altkrystallinen Schiefergesteinen aus dem Gebiete der argentinischen Republik von B. Kühn.Neues Jahrbuch für Min., etc., Beit. Bd. VII., 1891, p. 295.

Untersuchung argentinischer Pegmatite, etc., von P. Sabersky, ib. p. 359.

Untersuchungen an argentinischen Graniten, etc., von J. Romberg, ib., VIII., 1892, p. 275.

Travelers and foreign residents in South America are rapidly furnishing information relative, not only to the volcanic, but also to the older crystalline rocks composing the great Andes chain. Since the early observations of Darwin,[1] the petrographical collections made by Stelzner during his three years' residence, as professor, at Cordova (1873-1876) have been described by himself[2] and Franke,[3] while the results of detailed studies of the more extensive collections gathered by Stelzner's successor, Professor L. Brackebusch, are now beginning to appear. Professor Brackebusch's residence in the Argentine Republic lasted from 1876 till 1883, and during this period he made numerous scientific expeditions.[4] The petrographical material thus obtained has been confided to specialists in Germany for study. Three papers dealing with the crystalline schists (gneisses),[5] pegmatites,[6] and granites,[7] have recently appeared. The rocks of the granite contact-zones

  1. ↑ Geological Observations in South America, 1846.
  2. ↑ Beiträge zur Geologie und Paleontologie der argentinischen Republik; I. Geologischer Theil, 1885.
  3. ↑ Studien über Cordillerengesteine.Apolda, 1875.
  4. ↑ Reisen in den Cordilleren der argentinischen Republik, Verh. der Gesellsch. für Erdkunde.Berlin, 1891.
  5. ↑ Untersuchungen an altkrystallinen Schiefergestenien aus dem Gebiete der argentinischen Republik, von B. Kühn.Neues Jahrbuch für Min., etc., Beit. Bd. VII., 1891, p. 295.
  6. ↑ Untersuchung argentinischer Pegmatite, etc., von P. Sabersky, ib., p. 359.
  7. ↑ Untersuchungen an argentinischen Graniten, etc., von J. Romberg, ib., VIII., pp.

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