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Казанский ярусstresses
geol. Kazanian (ajre)
казанский ярус
geol. Kazanian (MichaelBurov); Kaz (MichaelBurov)
stratigr. Kazanian Stage (MichaelBurov); Kazanian strata (MichaelBurov); Kazanian sequence (MichaelBurov)