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Upper Cretaceous and Cenozoic deposits from the Colorado and Austral basins, Argentina …


Biology Articles » Paleobiology » Micropaleobiology » Diconodinium lurense sp. nov., a late Maastrichtian to Danian dinoflagellate cyst from southwest Atlantic basins

Abstract
- Diconodinium lurense sp. nov., a late Maastrichtian to Danian dinoflagellate cyst from southwest Atlantic basins

Diconodinium lurense sp. nov., a late Maastrichtian to Danian dinoflagellate cyst from southwest Atlantic basins

G. Raquel Guerstein 1,2 , Gabriela L. Junciel 1 , M.Verónica Guler 1,2 and Gloria Daners 3

1Departamento de Geología, Universidad Nacional del Sur. San Juan 670, B8000ICN Bahía Blanca, Argentina. gmguerst@criba.edu.ar
2 Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
3 Departamento de Paleontología, Facultad de Ciencias, Iguá 4225, 11400 Montevideo, Uruguay.

Abstract. Upper Cretaceous and Cenozoic deposits from the Colorado and Austral basins, Argentina and the Punta del Este Basin, Uruguay contain diverse organic-walled dinoflagellate cysts, including Diconodinium lurense sp. nov. which occurs in the late Maastrichtian and Danian throughout the basins. The new species is characterized by an autophragm that is densely covered by short spines and by relatively long apical and antapical horns, and by a variable Ia to IPa archeopyle. On our evidence, the stratigraphical range of Diconodinium lurense sp. nov. is latest Maastrichtian to Danian, and is thus a useful biostratigraphical marker for the Cretaceous-Palaeogene transition in the southwest Atlantic basins.

Key words. Biostratigraphy. Dinoflagellate cysts. Late Maastrichtian-Danian. Southwest Atlantic.

Ameghiniana, Mar./June 2005, vol.42, no.2, p.329-338. An Open Access Article.


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