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In 1793 Peter Simon Pallas, as a result of his study of the two principal mountain ranges of Siberia, decided that the characteristic structure of mountain ranges was a central core of granite with schistose rocks containing no fossils along the flanks of the granite, and with fossil-bearing limestone rocks lying outside and above the schistose.
Peter Simon Pallas was a German naturalist, who had been summoned to
John discusses an example by the German naturalist, Peter Simon Pallas, in his