Leitfossilien: ein Hilfsbuch zum Bestimmen von Versteinerungen bei geologischen Arbeiten in der Sammlung und itn Felde

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    Abstract

    THE publication of this useful work on characteristic fossils has extended over a long period. Part 1 (Cambrian and Silurian) was issued in 1908; part 2 (Devonian) in 1909; part 3 (Carboniferous and Permian) in 1923. The portion recently published deals with the invertebrates and calcareous algæ of the marine Trias, and has the inestimable advantages of being the work of Prof. C. Diener, whose researches on Triassic cephalopods are known to all geologists and palæontologists. The treatment of the subject is strictly systematic; in each group of fossils the characters of the families and genera are given, with notes on some of the important species. The work is illustrated by numerous figures, mainly copied from the memoirs of recognised authorities, but those of the calcareous algae are from original drawings by Dr. Julius Pia. Short but useful bibliographies are given for each group of fossils. The work concludes with tables showing the stratigraphical divisions, and the ranges of the characteristic fossils, in all the principal regions of the world where the marine Trias is developed. It is to be regretted that this part, like parts 1 and 2, is without an index.

    Georg Gürich

    Leitfossilien: ein Hilfsbuch zum Bestimmen von Versteinerungen bei geologischen Arbeiten in der Sammlung und itn Felde.

    Herausgegeben von. Vierte Lieferung: Leitfossilien der Trias. Wirbellose Tiere und Kalkalgen, von C. Diener. Pp. ii + 118 + 28 Tafeln. (Berlin: Gebrüder Borntraeger, 1925.) 24 gold marks.

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