A comparative study on Upper Jurassic radiolarian biostratigraphy of the Taman Formation, east-central Mexico and the ODP Site 801B Section, west Pacific

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This study reveals that the following zonal marker taxa occur both in the Taman Formation and at the ODP Site 801B section: Acanthocircus dicranacanthos (Squinabol), Hsuum maxwelli Pessagno, Mirifusus guadalupensis Pessagno, Genus Perispyridium Dumitrica, Pseudodictyomitra carpatica (Lozyniak), and Vallupus hopsoni Pessagno and Blome. Six bio-events, such as the first occurrence biohorizon (FOB), the last occurrence biohorizon (LOB) and the evolutionary first appearance biohorizon (EFAB), are commonly identified in the Taman Formation and in the ODP Site 801B　section: (1) LOB of Mirifusus guadalupensis Pessagno, (2) LOB of the Hsuum maxwelli Pessagno group, (3) FOB of Vallupus hopsoni Pessagno and Blome, (4) LOB of Genus Perispyridium Dumitrica,　(5) EFAB of Pseudodictyomatra carpatica (Lozyniak), and (6) FOB of Acanthocircus dicranacanthos　(Squinabol). By using these bio-events, the North American and Japan-Pacific radiolarian zones are correlated with each other. North American Zone 3/Zone 4 and Zone 4/Zone 5 boundaries are situated within the Japan-Pacific Loopus primitivus Zone and Pseudodictyomitra carpatica Zone, respectively. Conversely, the Japan-Pacific Hsuum maxwelli/Loopus primitivus and Loopus primitivus/Pseudodictyomitra carpatica zonal boundaries are situated within North American Zone 3 (Subzone 3α) and Zone 4 (around Subzone 4β /Subzone 4α boundary), respectively.

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