Page:The Journal of geology (IA journalofgeology11893univers).pdf/434
Reviews.
Recent Contributions to the Subject of Dynamometamorphism from the Alps.
- A. Heim: Geologie der Hochalpen zwischen Reuss und Rhein. Beiträge zur geologischen Karte der Schweiz, Vol. XXV., 4°: Bern, 1891, pp. 503.
- C. Schmidt: Beiträge zur Kenntniss der auftretenden Gesteine. ib. Anhang, pp. 76.
- L. Milch: Beiträge zur Kenntniss des Verrucano. Erster Theil: Leipzig, 1892, pp. 145.
- M. P. Termier: Etude sur la Constitution géologique du Massif de la Vanoise. Bull. des Services de la Carte géol. de France.No. 20, Paris, 1891, pp. 147.
For many years both Huttonian (metamorphic) and Wernerian (original deposition) principles have been advanced to explain the crystalline schists of the Alps, as well as those of other regions. Because of their youth these great mountains are in many ways peculiarly fitted to throw light upon the difficult problems presented by these rocks. Many of the most classic Alpine localities are now being investigated by modern methods and are yielding welcome results which tend to establish not merely the fact, but also the nature, cause and processes of metamorphism.
Nowhere is this more than true than in the region of vast earth-movements which Professor Heim of Zurich, has made the scene of his life work. As the result of his labors in this field, he was able to publish in 1878 his monograph on the Tödi-Windgälle group and the accompanying essay on the Mechanism of Mountain-making—a work which must certainly be regarded as epoch-making in suggesting the clue to a satisfactory explanation of the problems of regional metamorphism. This book Professor Heim now supplements with another of almost equal size, which contains the explanatory and descriptive text of the remainder of Sheet XIV of the Geological Survey of Switz-
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