Boletín de Geología

Vol. 29 No. 2 (2007): Boletin de Geologia
Articles

CALCAREOUS NANOFOSSILS FROM THE ARROYO ALFÉREZ SECTION (CARMEN DE BOLÍVAR): A PRELIMINARY BIOZONATION FOR THE OLIGOCENE-MIDDLE MIOCENE OF NORTHERN COLOMBIA

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  • Mejía A. E.,
  • J. A Flores,
  • V Torres
Mejía A. E.
Universidad de Salamanca
J. A Flores
Universidad de Salamanca
V Torres
Instituto Colombiano del Petróleo

How to Cite

A. E., M., Flores, J. A., & Torres, V. (2007). CALCAREOUS NANOFOSSILS FROM THE ARROYO ALFÉREZ SECTION (CARMEN DE BOLÍVAR): A PRELIMINARY BIOZONATION FOR THE OLIGOCENE-MIDDLE MIOCENE OF NORTHERN COLOMBIA. Boletín De Geología, 29(2). Retrieved from https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/430
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Abstract

 

A nanofossils-based biostratigraphic scheme is presented for the northern Colombia. Fourty (40) outcrop samples from the Arroyo Alférez section were analysed for nanofossils content. Taxa presented along the section are Cyclicargolithus foridanus, Cyclicargolithus abisectus, Reticulofenestra minuta, Reticulofenestra minutula, Reticulofenestra media and Reticulofenestra pseudoumbilicus. Helicosphaera sp. was abundant in some intervals, while Discoasterids increase to the top of the section. Biozones NP23 to NN5 (Martini, 1971) and CP18 to CN4 (Bukry, 1973; 1975) have been identifed, indicating Early Oligocene (Rupelian) to Middle Miocene (Langhian-Serravallian) age for the section. The biozonation of the Arroyo Alférez constitutes the frst nanoplanckton-based approach to construct a biochronologic scheme for the Cenozoic of northern Colombia with application on oil exploration of the offshore areas of the Colombian Caribbean basin.

 

Key words: Nanofossils, bioestratigraphy, Carmen de Bolívar, Oligocene, Miocene.

 

 

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References

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