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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Apr 2026
Research article |
| 15 Apr 2026
| 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
CORRESPONDING AUTHOR
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
Andrea Concheyro
Instituto Antártico Argentino (IAA), Buenos Aires, Argentina
IDEAN-CONICET, Departamento de Ciências Geológicas, Universidade de Buenos Aires, Pavilhão II, Cidade Universitária, 1428, Buenos Aires, Argentina
Marlone H. H. Bom
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
Rodrigo M. Guerra
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
Museu Itinerante de Ciências Naturais, Rua Buarque de Macedo, 4242, sala 1, Carlos Barbosa, RS, Brazil
Karlos G. D. Kochhann
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Thorsten Bauersachs
RWTH Aachen University, Institute for Organic Biogeochemistry in Geo-Systems, Aachen, Germany
Lorenz Schwark
Christian-Albrechts-University, Institute of Geosciences, Ludewig-Meyn-Straße 10, 24118 Kiel, Germany
Daiane Ceolin
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
Telma Musso
CONICET, Instituto de Investigação e Desenvolvimento em Engenharia de Processos, Biotecnologia e Energias Alternativas e Faculdade de Engenharia e Universidade Nacional del Comahue, Buenos Aires 1400, 8300 Neuquén, Argentina
Gerson Fauth
Technological Institute for Paleoceanography and Climate Change (itt OCEANEON), UNISINOS University, São Leopoldo, Brazil
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Short summary
The Maastrichtian–Danian record at Cerro Azul (Argentina) shows shifts in planktic foraminiferal assemblages and sea surface temperatures (SSTs) (TEXH86) 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.
The Maastrichtian–Danian record at Cerro Azul (Argentina) shows shifts in planktic foraminiferal...
