ABSTRACT
The Permian Word formation and correlatives are widely distributed in Permian basin areas of Kansas, Oklahoma, Texas, and New Mexico. The formation includes strata that yield diversified assemblages of invertebrate fossils, among which at a locality the ammonoid Perrinites also occurs. Elements in these faunal assemblages are important for criteria that may be used to establish Word time-stratigraphic relationships with other middle Permian deposits elsewhere. It is now considered that Word strata are correlative with strata of the Cherry Canyon and the Brushy Canyon of the Delaware Mountain group, the San Andres group, the Blaine and the Dog Creek formations, of Permian basin areas.
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