Chernykh Valery V.
Usolka section (southern Urals, Russia): a potential candidate for GSSP to define the base of the Gzhelian Stage in the global chronostratigraphic scaleValery V. Chernykh, Boris I. Chuvashov, Vladimir I. Davydov, Mark Schimtz, Walter S. Snyder
GEOLOGIJA 49/2 (2006), 205 - 217
