Articles | Volume 41, issue 1
J. Micropalaeontol., 41, 1–27, 2022
J. Micropalaeontol., 41, 1–27, 2022

Research article 07 Feb 2022

Research article | 07 Feb 2022

Astronomical calibration of late middle Eocene radiolarian bioevents from ODP Site 1260 (equatorial Atlantic, Leg 207) and refinement of the global tropical radiolarian biozonation

Mathias Meunier and Taniel Danelian

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Cited articles

Agnini, C., Fornaciari, E., Raffi, I., Catanzariti, R., Pälike, H., Backman, J., and Rio, D.: Biozonation and biochronology of Paleogene calcareous nannofossils from low and middle latitudes, Newsl. Stratigr., 47, 131–181,, 2014. 
Bjørklund, K. R.: Radiolaria from the Norwegian Sea, Leg 38 of the Deep Sea Drilling Project, in: Initial Reports of the Deep Sea Drilling Project, 38, edited by: Talwani, M., Udintsev, G., Bjørklund, K., Caston, V. N. D., Faas, R. W., Kharin, G. N., Morris, D. A., Müller, C., Nilsen, T. H., van Hinte, J., Warnke, D. A., and White, S. M., U.S. Govt. Print. Office, Washington, DC, USA, 1101–1168,, 1976. 
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Boulila, S., Vahlenkamp, M., De Vleeschouwer, D., Laskar, J., Yamamoto, Y., Pälike, H., Kirtland Turner, S., Sexton, P. F., Westerhold, T., and Röhl, U.: Towards a robust and consistent middle Eocene astronomical timescale, Earth Planet. Sc. Lett., 486, 94–107,, 2018. 
Short summary
This study presents the biostratigraphic analysis of radiolaria (siliceous zooplankton) from a section of middle Eocene age located in the equatorial Atlantic. Our study allows the refinement of the age of 71 radiolarian bioevents. Based on a comparison with previously reported ages in the equatorial Pacific and northwestern Atlantic, we establish the synchronicity of several bioevents between the two oceans. Some of these synchronous bioevents were used to define seven new subzones.