Cretaceous-Terciary non-marine ostracoda from the Hengyangand Dongting basins, Hunan province, Southern China

• F.M. Swain ^[1] ; He Jun De ^[2] ; Ye Chun Li ^[2] ; Zhang Xiao Jun ^[3]
  1. [1] University of Minnesota

     University of Minnesota

     City of Minneapolis, Estados Unidos

     
  2. [2] Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing,P.R.China
  3. [3] The 5th Geological Surveying and Exploring Team, Ministry of Geology

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• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 20, Nº. 2, 1988, págs. 273-323
• Idioma: inglés
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• Resumen

  • In this paper 65 species of freshwater Ostracoda from Upper Cretaceous and Lower Eocene deposits, totaling more than 5000 m thick, in Hunan province southern China, are described and illustrated. Fourteen of the species are new, 34 were described previously, and 17 are left in open nomenclature or are given affinitive assignment. The new species are: Cyprinotus subspecies, n. sp., Paraeucypris paratriangulata, n. sp., P. tumida, n. sp., and Cypridosella reticulata, n. sp., all from the Lower Eocene; Paraeucypris arca, n. sp., Talicypridea hunanensis, n. sp., T. subquadrata, n. sp., T. cuneata, n. sp., T. subparallela, n. sp., T. hebes, n. sp., T. dongtingensis, n. sp., T. lunata, n. sp., T. formosa, n. sp., and t. tongdongensis, n. sp., all from the Upper Cretaceous.

    The late Cretaceous ostracode assemblage is represented by Cypridea (Cypridea) cavernosa, Talicypridea biformata, and Candona wangdianensis. In the Hengyang Basin, the Cretaceous consists of the Daijiaping Formation (600 m). In the Dongting Basin the Cretaceous is represented by the Fenshuiao Formation (800 m); both formations were deposited under lacustrine quiet water conditions.

    The early Eocene ostracode assemblage is typified by Pseudoeucypris pagei, Sinocypris exselsa, and Limnocythere hubiensis. The Eocene in the Hengyang basin consists of the lacustrine Limuping Formation (430 m) and underlying Xialiushi Formation (650 m); the Paleocene Chejiang Formation (200 m) is unfossiliferous. In the Dongting Basin the Paleocene and Eocene are formed of the Yuanjiang Group (700 m), of lacustrine and fluvial origin; the Paleocene portion is unfossiliferous.