EARLY CRETACEOUS DINOFLAGELLATE CYSTS FROM THE AGRIO FORMATION AT ITS TYPE LOCALITY (NEUQUÉN BASIN, ARGENTINA) AND THEIR BIOSTRATIGRAPHIC IMPLICATIONS

Authors

  • Melisa Andrea Paolillo Instituto Geológico del Sur, Departamento de Geología, Universidad Nacional del Sur (UNS), San Juan 670, 8000 Bahía Blanca, Argentina
  • María Verónica Guler Instituto Geológico del Sur, Departamento de Geología, Universidad Nacional del Sur (UNS), San Juan 670, 8000 Bahía Blanca, Argentina
  • Darío Lazo Instituto de Estudios Andinos “Don Pablo Groeber”, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Intendente Gu?iraldes 2160, C1428EGA Ciudad Autónoma de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Godoy Cruz 2290, C1425FQB Ciudad Autónoma de Buenos Aires
  • Pablo Jose Pazos Instituto de Estudios Andinos “Don Pablo Groeber”, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Intendente Gu?iraldes 2160, C1428EGA Ciudad Autónoma de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Godoy Cruz 2290, C1425FQB Ciudad Autónoma de Buenos Aires
  • Guillermo Ottone Instituto de Estudios Andinos “Don Pablo Groeber”, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Intendente Gu?iraldes 2160, C1428EGA Ciudad Autónoma de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Godoy Cruz 2290, C1425FQB Ciudad Autónoma de Buenos Aires
  • Beatriz Aguirre-Urreta Instituto de Estudios Andinos “Don Pablo Groeber”, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Intendente Gu?iraldes 2160, C1428EGA Ciudad Autónoma de Buenos Aires Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Godoy Cruz 2290, C1425FQB Ciudad Autónoma de Buenos Aires

Keywords:

Dinoflagellate cysts. Agrio Formation. Early Cretaceous. Biostratigraphy

Abstract

The Early Cretaceous marine deposits of the Agrio Formation are widely distributed in southern Mendoza and Neuquén provinces, Argentina. The stratigraphic distribution of upper Valanginian to upper Hauterivian organic-walled dinoflagellate cysts was evaluated at the Agrio Formation, at Bajada del Agrio locality. The assemblages exhibit a relatively moderate to low diversity and those with greater abundance are dominated by a small number of species such as Circulodinium distinctum, Cribroperidinium spp., Exochosphaeridium spp., Florentinia mantellii, Kiokansium unituberculatum, and Oligosphaeridium complex. Three diagnostic bioevents of lowest (LO) and highest (HO) stratigraphic occurrences of taxa calibrated with the local ammonoid zonation were identified for the Early Cretaceous of the Neuquén Basin: the LO of Callaiosphaeridium sp. (base of Holcoptychites neuquensis Zone, earliest Hauterivian), the LO of Cymososphaeridium validum (uppermost Hoplitocrioceras gentilii Zone, upper early Hauterivian) and the HO of Cymososphaeridium validum (lowermost Crioceratites diamantensis Zone, late Hauterivian). The studied assemblages are compared with Early Cretaceous assemblages from the Northern Hemisphere. In general, the association of dinoflagellate cysts together with the selected diagnostic species exhibit a clear affinity with those of the Mediterranean region.

Published

2018-11-20

How to Cite

Paolillo, M. A., Guler, M. V., Lazo, D., Pazos, P. J., Ottone, G., & Aguirre-Urreta, B. (2018). EARLY CRETACEOUS DINOFLAGELLATE CYSTS FROM THE AGRIO FORMATION AT ITS TYPE LOCALITY (NEUQUÉN BASIN, ARGENTINA) AND THEIR BIOSTRATIGRAPHIC IMPLICATIONS. Ameghiniana, 55(5), 554-570. Retrieved from https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3176

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