Miocene and pliocene freshwater ostracoda from California, Nevada and Oregon

• 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. 22, Nº. 1, 1990, págs. 143-159
• Idioma: inglés
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• Resumen

  • Eighteen species of freshwater Ostracoda are recorded from (1) Pliocene or late Miocene lake beds of southern California (2), Pliocene Idaho Group, undifferentiated, of eastern Oregon, and (3) Miocene Truckee Formation of west-central nevada. One new genus, Malheurocypris, n. gen., based on a previously described species, and one new species, Candona kittlemani, n. sp. are described.

    The lake beds in Beartrap Canyon, Los Angeles County, California contain ostracode species referable to forms in the Humboldt Formation (Miocène) and the Cache Valley formation (Pliocene) of Nevada and Utah. The strata were stated to be Lower? Pliocene by Eaton (1939), but may be in part Upper Miocene.

    Lacustrine beds of the Idaho Group in Harney and Malheur Counties, eastern Oregon yielded osradode species comparable to those in the Hay Ranch and Cache Valley Formations (Pliocene) of Nevada, Utah, and Idaho and are believed to be of that age.

    The Truckee diatomites of west-central Nevada yielded ostracodes described from the Humboldt and Esmeralda Formations of northeastern and western Nevada, respectively, and is believed to be Miocene and the locality sampled. Elsewhere the Truckee has been stated to be Pliocene (Axelrod, 1956).