We have studied Mn-carbonates revealed earlier by G.S. Yasovich, I.N. Ushatinsky, and O.G. Zaripov in the Upper Jurassic deposits of the Georgievka Horizon in the western part of the West Siberian Plate at depths of 1600–1800 m. The carbonates are similar in Mn content, thickness of ore beds, and area of occurrence to Mn-carbonate ores of the Chiaturskoe deposit and Nikopol’ basin and abound in massive, stromatolite, oncolite, microstromatolite, and microoncolite varieties. The slackening Mn mineralization is traceable for 750 km to the east.
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