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[Professor Smirnov's paper is available only in this abbreviated form. Editor]

  1. 1

    Classical deposits of the type under consideration are well known inside the territory of the Soviet Union in the Russian Platform, in Siberia, Kazakhstan, Middle Asia and the Caucasus.

  2. 2

    In the broad regional geological plan three groups can be recognized, among them:

    1. (1)

      Formation on ancient platforms;

    2. (2)

      Formation on younger platforms;

    3. (3)

      Formation in the folded regions in the later stages of the geosynclinal cycle.

  3. 3

    In the sedimentary rocks of the upper structural stage of the Russian and Siberian platforms stratiform deposits of fluorite, sphalerite and galena are well known among carbonate beds of different ages from Lower Cambrian to the Triassic.

  4. 4

    On the superimposed molds of the post-Caledonian platform in Central Kazakhstan, stratiform deposits of lead and zinc are well known among Upper Devonian strata of dolomitized limestone.

  5. 5

    In the sedimentary rocks of the folded regions belonging to the Hercynian cycle these deposits are well known in the carbonate beds of Devonian and Carboniferous age in Middle Asia and Western Kazakhstan; in the similar rocks belonging to the Alpine cycle, they are found in Georgia in the Caucasus.All the deposits have distinctive traits typical of similar deposits all over the world and so, as everywhere, their genesis is disputable.In favor of the syngenetic sedimentary origin of these deposits the following

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