Planktic foraminiferal distribution across the Cretaceous–Paleogene (K–Pg) boundary from the Neuquén Basin (Cerro Azul section): biostratigraphy and paleoenvironmental significance

Krahl, Guilherme; Concheyro, Andrea; Bom, Marlone H. H.; Guerra, Rodrigo M.; Kochhann, Karlos G. D.; Bauersachs, Thorsten; Schwark, Lorenz; Ceolin, Daiane; Musso, Telma; Fauth, Gerson

doi:10.5194/jm-45-297-2026

Articles | Volume 45, issue 1

https://doi.org/10.5194/jm-45-297-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/jm-45-297-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 45, issue 1

Research article

|

15 Apr 2026

Research article |

| 15 Apr 2026

Planktic foraminiferal distribution across the Cretaceous–Paleogene (K–Pg) boundary from the Neuquén Basin (Cerro Azul section): biostratigraphy and paleoenvironmental significance

Guilherme Krahl, Andrea Concheyro, Marlone H. H. Bom, Rodrigo M. Guerra, Karlos G. D. Kochhann, Thorsten Bauersachs, Lorenz Schwark, Daiane Ceolin, Telma Musso, and Gerson Fauth

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Latest update: 16 Apr 2026

Short summary

The Maastrichtian–Danian record at Cerro Azul (Argentina) shows shifts in planktic foraminiferal assemblages and sea surface temperatures (SSTs) (TEX^H₈₆) tied to the K–Pg (Cretaceous–Paleogene) extinction. Guembelitriid dominance and high-latitude affinity define the early Danian, with Antarcticella pauciloculata present. At 45 cm above the boundary, tropical species appear with a ~1.5 °C SST rise, signalling initial post-extinction climatic recovery.