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the zone of the general stratigraphic scale below the stage. A chronozone may be traced in rock strata of different lithological compositions, where the typical complex of fossil organisms may change considerably. It differs from the biostratigraphic zone, whose paleontological features remain constant. The term “chronozone” was introduced in 1961 by the Norwegian geologist G. Henningsmoen. (SeeSTRATIGRAPHY.)