Publisher's Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...and Fassa Valley; in 1855 the Norwegian mineralogist, Kjerulf, published his accurate mineralogical and chemical investigation of the Monzoni syenite. Baron von Richthofen's monograph, published in 1860, still forms the best foundation for the geology of South Tyrol. He determined a definite succession in the Triassic eruptive rocks--first the basic series, augite, porphyrite, monzonite, and hypersthenite, then flows of lava, or the infilling of fissures by tourmaline granite, melaphyre, and liebenerite porphyry. Three years later Bernhardt von Cotta's paper appeared on the intrusions and ramifications of the Monzoni syenite into the limestone, on contact minerals, and on the melaphyre dykes in the limestone and dolomite. Lapparent in 1864 sub-divided the eruptive rocks of the neighbourhood into a basic and an acid group, without entering into the particular succession, but Doelter's petrographical studies led him to much the same conclusion about the succession as Richthofen had formed. Reyer, on the other hand, thought that granite and then syenite had been intruded during the Muschelkalk period; monzonite, porphyrite, and andesite had followed; but in his opinion the same eruptive series had been repeated in various geological epochs. Mojsisovics' work, The Dolomite Reefs of South Tyrol, supplies a comprehensive account of this district, and forms the text to the Austrian Geological Survey Maps. More recently the Norwegian geologist, Professor Broegger, has drawn a comparison between the rocks of the South Tyrol eruptive area and those of the Christiania area. He demonstrates that Richthofen's "Melaphyre" of the Mulatto mountain is not younger but older than the tourmaline granite, and that altogether the basic eruptions of augite, ...
