Abstract
A QUESTION which has during the last few years occupied Russian geologists is whether the upper horizon of the “mottled marls,” which were considered by Murchison as Permian, must be still regarded as such, or rather as a member of the Trias—an opinion strongly advocated by several eminent geologists in Russia. The question is a large one, the mottled marls being the most widely-spread member of Murchison's Permian formation in Russia, and covering it almost on the whole of the surface it occupies in Russia in Europe. Were the Triassic origin of the mottled marls an established fact, the whole aspect of a geological map of Russia would be changed, and so it was on the map published in 1870 by a late member of the Academy, M. Helmersen, and on the map of the western slope of the Ural Mountains by Prof. Meller. The question is thus the subject of much controversy, and a whole series of papers is devoted to it in the Memoirs of the Kazan Society of Naturalists and elsewhere. The last of this series is a paper by Prof. Stuckenberg, which states the present aspect of the question and enables us to summarise the controversy in its broad features.
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References
"The Upper Mottled Marls and their Relations to other Members of the Permian System," by A. Stuckenberg . (Memoirs of the Kazan Society of Naturalists, vol. xi. fasc. 2; Kazan, 1882.
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The Permian System in Russia 1 . Nature 28, 165–166 (1883). https://doi.org/10.1038/028165a0
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DOI: https://doi.org/10.1038/028165a0