Lower and Middle Devonian Malvinokaffric ostracods from the Precordillera Basin of San Juan,Argentina |
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| Institution: | 1. Earth Sciences Department, Memorial University of Newfoundland, St. John''s, NL A1B 3X5, Canada;2. Istanbul Technical University, Faculty of Mines, 80626 Maslak, Istanbul, Turkey;1. Laboratory of Theoretical Spectroscopy, V.E. Zuev Institute of Atmospheric Optics, SB RAS, 1, Akademician Zuev Sq., Tomsk 634055 Russia;2. Tomsk State University 36, Lenin Ave., Tomsk 634050 Russia;3. Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 7331, UFR Sciences BP 1039, Reims Cedex 2 51687, France |
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| Abstract: | Ostracod from the upper Lower to Middle Devonian rocks of the Argentine Precordillera Basin (Talacasto and Punta Negra formations) are studied. One new genus Pircawayra nov. gen., and five species (including three new: Pircawayra gigantea nov. gen. and sp., Lapazites trinodis nov. sp. and Keslingiella? teresae nov. sp.) are defined. The recorded ostracod fauna closely resembles that coeval from Bolivia and South Africa, exhibiting a remarkable endemism, not only at the genus level, but also at the species level. In addition to its low-diversity, the Malvinokaffric ostracod association is also characterized by having large, thick, coarsely ornamented and swollen valves. The similar ostracod composition from the Andean and South African basins suggests faunal exchange between these two areas. Based on the ostracod faunas, the Malvinokaffric Realm is clearly recognizable at least up to the Middle Devonian. |
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