Journal of Micropalaeontology
Journal of Micropalaeontology
JM
Articles | Volume 45, issue 1
Articles | Volume 45, issue 1
https://doi.org/10.5194/jm-45-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-45-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 45, issue 1
Research article
 | 
06 Jan 2026
Research article |  | 06 Jan 2026

Tropical ecosystem shifts at the Eocene–Oligocene transition in the southwestern Caribbean region

Raúl Trejos-Tamayo, Darwin Garzón, Diana Ochoa, Angelo Plata-Torres, Fabrizio Frontalini, Felipe Vallejo-Hincapié, Fátima Abrantes, Vitor Magalhães, Viviana Arias-Villegas, Carlos Jaramillo, Jaime Escobar, Jason H. Curtis, José-Abel Flores, Constanza Osorio-Tabares, Mónica Duque-Castaño, Erika Bedoya, and Andrés Pardo-Trujillo

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Short summary
Our study investigates how tropical marine ecosystems responded to climate change during the Eocene–Oligocene transition (~34 Ma). Based on microfossil and geochemical data from a Caribbean drill core, we identify enhanced terrigenous input, increased surface productivity, changes in carbonate preservation, and reduced deep-water oxygenation. Likely driven by global cooling and sea-level fall, these shifts offer new insights into low-latitude paleoenvironmental change.
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