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Chernyk, V. V., Chuvashov, B. I., Davydov, V. I., Schmitz, M., Snyder, W. S.
Usolka section (souther Urals, Russia): a potential candidate for GSSP to define the base of the Gzhelian Stage in the global chronostratigraphic scale
2006. Geologija 49/2, 205-218
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