THE GUADALUPIAN: PROPOSED INTERNATIONAL STANDARD FOR A MIDDLE PERMIAN SERIES
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The type Guadalupian is proposed formally as the international standard for a Middle Permian Series. Also, composite stratotypes for the three component stages (in ascending order, Roadian, Wordian, Capitanian) are proposed within or closely adjacent to the Guadalupe Mountains National Park in Texas, southwestern United States of America. The lower boundary of the Roadian Stage is defined by the first appearance of the conodont Mesogondolella serrata (?=M. nankingensis) within the morphological transition between M. idahoensis and M. serrata, and in turn establishes the top of a Lower Permian Series, defined elsewhere. Fossiliferous post-Capitanian sediments are known in the type and several other areas around the margins of the Delaware Basin, but it is proposed that the top of the. 1992 Taylor & Francis Group, LLC.