permian.stratigraphy.org
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Anchor text: Proposal of Guadalupian and component Roadian, Wordian and Capitanian stages as international standards for the middle Permian series
Wikipedia: List of Global Boundary Stratotype Sections and Points
Wikipedia: List of Global Boundary Stratotype Sections and Points
Anchor text: The international Permian timescale: March 2013 update
Anchor text: Permian Stratigraphy – International Commission on Stratigraphy International Union of Geological Sciences