Articles | Volume 45, issue 1
https://doi.org/10.5194/jm-45-297-2026
https://doi.org/10.5194/jm-45-297-2026
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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Cited articles

Arenillas, I., Arz, J. A., and Gilabert, V.: Blooms of aberrant planktic foraminifera across the K/Pg boundary in the Western Tethys: causes and evolutionary implications, Paleobiology, 3, 1–17, https://doi.org/10.1017/pab.2018.16, 2018. 
Arenillas, I., Arz, J. A., Molina, E., and Dupuis, C.: An independent test of planktic foraminiferal turnover across the Cretaceous/Paleogene (K/P) boundary at El Kef, Tunisia: Catastrophic mass extinction and possible survivorship, Micropaleontology, 46, 31–49, https://www.jstor.org/stable/1486024 (last access: 10 October 2024), 2000. 
Aze, T., Ezard, T. H. G., Purvis, A., Coxall, H. K., Stewart, R. M., Wade, B. S., and Pearson, P. N.: A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data, Biol. Rev., 86, 900–927, https://doi.org/10.1111/j.1469185X.2011.00178.x, 2011. 
Ballent, S. C.: Foraminíferos del Jurásico medio (Límite Aaleniense-Bajociense) del centro-oeste de Argentina, Sistemática. Revista Española de Micropaleontolgía, 31, 123–147, 1999. 
Ballent, S., Concheyro, A., Náñez, C., Pujana, I., Lescano, M., Carignano, A. P., Caramés, A., Angelozzi, G., and Ronchi, D.: Microfósiles Mesozoicos y Cenozoicos, in: Relatorio del XVIII Congreso Geológico Argentino, Neuquén, Argentina, 489–528, ISBN 978-987-22403-3-2, 2011. 
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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.
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