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... to six close interlayers of kuckersite form the industrial layer, that is, the layer that is mined. The thicknesses of the shale interlayers and the limestones separating them in this stratum vary from a few centimeters to 0.9 m. The maximum general thickness of the industrial layer in the central part of the Estonian deposit reaches 3.2 m; the total thickness of the ...

... of combustible shales, called kuckersite, are found in the Llandeilo stage. The thickness of the Ordovician system on the platform does not exceed 200–250 m.On the western slope of the Urals, in the Pai-Khoi, and on Novaia Zemlia—the western miogeosynclinal zone of the Ural-Siberian geosynclinal belt—Ordovician deposits consist of marine terrigenous deposits and ...