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International Union of
Geological Sciences (IUGS)
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International
Commission on Stratigraphy (ICS)
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ICS-Subcommission on Triassic Stratigraphy
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ICS-Subcommission
of Permian Stratigraphy
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North American
Committee on Stratigraphic Nomenclature (NACSN)
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©SKPT/DSK2004
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