Some Oligocene and Miocene freshwater ostracoda from Central and Southern Nevada and Southwestern Texas

• F.M. Swain ^[1]
  1. [1] University of Minnesota

     University of Minnesota

     City of Minneapolis, Estados Unidos

     
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 19, Nº. 3, 1987, págs. 413-449
• Idioma: inglés
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• Resumen

  • This paper records and illustrates 32 species of freshwater ostracodes from Miocene lacustrine rocks of western and southern Nevada and from Oligocene lacustrine rocks of central Nevada and southwestern texas. Nine of the species are newly described, 11 were described previously and 12 are given affinitive assignment or are left in open nomenclature.

    The new species are: Kassinina gasspeakensis, n. sp. from the Miocene Horse Spring Formation, southern Nevada; Stenocypris? horsecampensis, n. sp., and Potamacypris? moorei, n. sp. from the Miocene Horse Camp Formation, esat-central Nevada; Disopontocypris? hendersoni, n sp., Turkmenella laeva, n. sp., T. wrriorensis, n. sp., Candoniella bergstromi, n. sp., and Candona clauseni, n. sp. from the Miocene Esmeralda Formation, western Nevada; and Cytheridella alpinensis, n. sp. from the Oligocene Buck Hill volcanic series, southwestern Texas.

    Other ostracode species are recorded from these formations as well as from the Oligocene Indian Well Formation of central Nevada, the Oligocene? Hells Bells Canyon Formation of south central Nevada; the Oligocene or Miocene North Creek Formation of east central Nevada; Miocene New Pass Tuff and the Oligocene Edwards Creek Tuff, west-central Nevada; the Eocene Twin Bridges Limestone, central Nevada, and the Oligocene Titus Canyon Formation of southwestern Nevada.

    A tentative sequence of freshwater ostracode assemblages in the Great Basin of the United States is presented.