Ostracoda from the Swift Formation (Upper Jurassic) of Montana and Wyoming

• Autores: F. M. Swain
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 30, Nº. 1, 1998, págs. 139-158
• Idioma: español
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• Resumen

  • This paper describes and illustrates 20 species of Ostracoda from the Swift Formation (Oxfordian and early Kimmeridgian) of Montana and Wyoming. One species (Cytherelloidea recurvoidea, n. sp.) is new, 11 species were previously described (one is given a new name) and eight species are given affinitive status or are left in open nomenclature.

    Among the Swift ostracode species 12 appear to be restricted to that formation or its correlatives in the area (Redwater Shale, upper Sundance Formation, South Dakota, Wyoming and Montana; and the upper Vanguard Formation in Saskatchewan) and are Oxfordian and early Kimmeridgian. The remaining eight Swift species occur also in pre-Oxfordian deposits in this region (Lower Sundance and Lower Vanguard Formation - Callovian). One species also has been recorded in Bathonian strata (upper member of Shaunavon Formation) in Saskatchewan by other workers.