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Guadalupian Series
Roadian Stage
Time:2012-09-27 viewd:6768 times

       The first appearance of Jinogondolella nankingensis evolved from Meosogondolella lamberti is defined as the base of the Guadalupian Roadian Stage which is at 42.7 m above the base of the Cutoff Formation in Stratotype Canyon (west face, southern Guadalupe Mountains, located at 31.8767o N., 104.8768o W. in USA), 29 cm below the prominent shale band in the upper part of the limestone unit in the El Centro Member.

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