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Why is the first appearance of the conodont Idiognathodus simulator important for the Gzhelian Stage?
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Carboniferous Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the late Carboniferous Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The first appearance of the conodont Idiognathodus simulator is considered important for the Gzhelian Stage because working groups of the International Commission on Stratigraphy (ICS) believe it is more useful for the global correlation of basal Gzhelian strata than the previously used fusulinid species.1
Conodonts are highly valued for such stratigraphic purposes because they evolved rapidly, were geographically widespread, and their distinct assemblages allow for precise identification and correlation of geologic time across different regions of the world.2