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Fusulinid Foraminifera are widespread in the Permian of America, Europe, and Asia and are among the best indices for correlation of Permian rocks. Twenty-six species or varieties of seven genera and two subfamilies are described from the Permian of California. Although Permian fusulinids are abundant in California, only a few species have been described from that area or any part of far western United States.

The Permian of America can be divided into four fusulinid faunal zones based on the predominance of certain genera: Zone of Pseudosckwagerina (Wolfcampian), Zone of Parafusulina (Leonardian and lower Guadalupian), Zone of Polydiexodina (upper Guadalupian), and Zone of Yabeina (? post-Guadalupian). The Permian fusulinid faunas of California are compared with all other principal American Permian fusulinid faunas.

The McCloud limestone and Nosoni formation of Northern California contain fusulinids of the Pseudosckwagerina and Parafusulina zones. The middle portion of the Bird Spring formation of Southern California contains fusulinids of the Pseudosckwagerina and possibly Parafusulina zones.

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