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Geological Society, London, Special Publications; 2005; v. 252; p. 57-81;
DOI: 10.1144/GSL.SP.2005.252.01.04
© 2005 Geological Society of London

Biostratigraphy

Lower Cretaceous (Berriasian-Aptian) biostratigraphy of the Neuquén Basin

M. Beatriz Aguirre-Urreta1, Peter F. Rawson2, G. Andrea Concheyro1, Paul R. Bown2 & Eduardo G. Ottone1

1 Laboratorio de Bioestratigrafía de Alta Resolución, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentinaaguirre{at}gl.fcen.uba.ar
2 Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK

The Berriasian-Aptian succession in the Neuquén Basin is mainly marine in the lower part and non-marine in the upper portion. A detailed ammonite zonation is presented for the Berriasian-?Early Barremian interval. While some ammonite taxa are endemic, others are widely distributed and there are several levels where correlation can be suggested with the ‘standard’ stages and zones of the Tethyan Mediterranean area. Several nannofossil bioevents are recognized, and these provide evidence for correlation with Tethyan areas. Correlations suggested by both groups are reasonably consistent. Berriasian-Aptian palynomorphs include both terrestrial and marine forms. Several terrestrial assemblages can be recognized, but the marine forms are mainly long-ranging taxa, especially in the Agrio Formation.





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D. G. Lazo, M. Cichowolski, D. L. Rodriguez, and M. B. Aguirre-Urreta
Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquen Basin, Argentina
Geological Society, London, Special Publications, 2005; 252: 295 - 315.
[Abstract] [PDF]