Calcareus nannofossils Upper Miocene biostratigraphy and biochronology at western equatorial Atlantic (ODP Site 999)
- Buitrago Reina, Yaned Margarita
- Flores Villarejo, José Abel
- Sierro Sánchez, Francisco Javier
ISSN: 0556-655X
Any de publicació: 2010
Volum: 42
Número: 3
Pàgines: 301-319
Tipus: Article
Altres publicacions en: Revista española de micropaleontología
Resum
The ODP Site 999 is located in the Colombian Caribbean basin (Atlantic NW). We analyze 154 samples with ages ranging between Tortonian (Upper Miocene) until Zanclean (Lower Pliocene). The biostratigraphy of this work is based on the standard zonal schemes for the Neogene. Initially, we determine the depths of the calcareous nannofossil events that we identify in this work, and then the ages for each of them. For this purpose, we use the data of the orbitally tuned 18O isotope record of the ODP Site 999A. We compare the results of the calibrated ages obtained in other basins by different authors to determine the synchronism or diachronism. We achieve the calibrated ages for 28 events and we conclude that 8 of them are synchronic, 8 diachronic, and for 12 of them there are no data to establish age differences.