Articles | Volume 44, issue 2
https://doi.org/10.5194/jm-44-319-2025
https://doi.org/10.5194/jm-44-319-2025
Research article
 | 
11 Sep 2025
Research article |  | 11 Sep 2025

Refining chitinozoan biostratigraphy through the early and late Aeronian biogeochemical events on Anticosti Island, Quebec, eastern Canada

Fien Marie Raf Jonckheere, Carolina Klock, André Desrochers, Pascale Daoust, and Thijs R. A. Vandenbroucke

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Cited articles

Achab, A.: Les chitinozoaires de la zone à Dicellograptus complanatus Formation de Vauréal, Ordovicien supérieur, Ile d'Anticosti, Québec, Can. J. Earth. Sci., 14, 413–425, 1977. 
Achab, A.: Sur Quelques Chitinozoaires de la Formation de Vauréal et de la Formation De Macasty (Ordovicien Supérieur), Ile d'Anticosti, Québec, Canada, Rev. Palaeobot. Palyno., 25, 295–314, 1978. 
Achab, A.: Biostratigraphie par les Chitinozoaires de l'Ordovicien Supérieur-Silurien Inférieur de l'Ile d'Anticosti, Résultats préliminaires, in: Field meeting, Anticosti-Gaspé, Québec, II: Stratigraphy and Paleontology, edited by: Lespérance, P. J., Subcommission on Silurian Stratigraphy and Ordovician-Silurian Boundary Working Group, Montreal, 143–157, 1981. 
Achab, A., Asselin, E., Desrochers, A., Riva, J. F., and Farley, C.: Chitinozoan biostratigraphy of a new Upper Ordovician stratigraphic framework for Anticosti Island, Canada, Bull. Geol. Soc. Am., 123, 186–205, https://doi.org/10.1130/B30131.1, 2011. 
Achab, A., Asselin, E., Desrochers, A., and Riva, J. F.: The end-Ordovician chitinozoan zones of Anticosti Island, Québec: Definition and stratigraphic position, Rev. Palaeobot. Palyno., 198, 92–109, https://doi.org/10.1016/j.revpalbo.2012.07.019, 2013. 
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Short summary
Anticosti Island holds a well-preserved rock record of the Silurian, offering a unique look at chitinozoan microfossil evolution. During the late Aeronian event, we recognise the emergence and radiation of highly ornamented species, challenging the typical extinction pattern we observe in other Silurian events. This study also fills an important gap in the microfossil record of Anticosti Island, improving our understanding of this critical time. 
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