Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada
<p>The well-preserved Llandovery (lower Silurian) succession of Anticosti Island (Quebec, eastern Canada) contains an expanded Aeronian–Telychian boundary interval when compared to other coeval basins. This boundary interval on Anticosti Island also includes two of the most important Llandover...
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Copernicus Publications
2024-12-01
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| Series: | Journal of Micropalaeontology |
| Online Access: | https://jm.copernicus.org/articles/43/475/2024/jm-43-475-2024.pdf |
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| author | C. Klock A. Desrochers P. I. McLaughlin P. Emsbo T. De Backer F. M. Jonckheere C. J. P. Esteves T. R. A. Vandenbroucke |
| author_facet | C. Klock A. Desrochers P. I. McLaughlin P. Emsbo T. De Backer F. M. Jonckheere C. J. P. Esteves T. R. A. Vandenbroucke |
| author_sort | C. Klock |
| collection | DOAJ |
| description | <p>The well-preserved Llandovery (lower Silurian) succession of Anticosti Island (Quebec, eastern Canada) contains an expanded Aeronian–Telychian boundary interval when compared to other coeval basins. This boundary interval on Anticosti Island also includes two of the most important Llandovery biogeochemical events, the late Aeronian and Valgu events. These two events were previously documented in the Jupiter and Chicotte formations through the study of conodont, graptolite, and brachiopod biostratigraphy and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C chemostratigraphy. Despite these multiple investigations, the exact position of the Aeronian–Telychian stage boundary on Anticosti Island has not been firmly established. Here we locally define and globally correlate chitinozoan biozones to refine the position of this stage boundary. The <i>Ancyrochitina ramosaspina</i> biozone, recognized in the Ferrum Member of the Jupiter Formation, correlates with the global <i>Conochitina alargada</i> biozone and indicates an Aeronian age. The <i>Eisenackitina dolioliformis</i> biozone suggests mostly a Telychian age for the Pavillon Member of the Jupiter Formation and the Chicotte Formation. Three new species are defined, namely <i>Conochitina asselinae</i> sp. nov., <i>Spinachitina glooscapi</i> sp. nov., and <i>Ancyrochitina wilsonae</i> sp. nov. (registration date: 4 December 2024, publication LSID: urn:lsid:zoobank.org:pub:11184506-F273-4D7A-BC28-A1BB4BC8FCD8, asselinae LSID: D282DA9D-6A9C-4B9E-AA6C-9ADC4473E95B, glooscapi LSID: 5801DC12-4EA1-439F-B7C8-FAF7C1B9D2C7, wilsonae LSID: 549EEF2F-7F19-4E6D-9F8E-384594B2FE65). Our new chitinozoan data, combined with previous studies, allow a comparison with the well-studied Baltic succession, confirming that limited unconformities mark the Aeronian–Telychian boundary interval on Anticosti Island, in contrast to the less complete coeval location. Our refined age model for the Aeronian to Telychian succession of Anticosti Island provides a solid baseline to study further Llandovery biochemical events in the aftermath of the Late Ordovician mass extinction.</p> |
| format | Article |
| id | doaj-art-7667df619d66482eb246ff38bdca40ea |
| institution | OA Journals |
| issn | 0262-821X 2041-4978 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Micropalaeontology |
| spelling | doaj-art-7667df619d66482eb246ff38bdca40ea2025-08-20T02:30:35ZengCopernicus PublicationsJournal of Micropalaeontology0262-821X2041-49782024-12-014347549510.5194/jm-43-475-2024Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, CanadaC. Klock0A. Desrochers1P. I. McLaughlin2P. Emsbo3T. De Backer4F. M. Jonckheere5C. J. P. Esteves6T. R. A. Vandenbroucke7Department of Geology, Ghent University, Ghent, BelgiumDepartment of Earth and Environmental Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, CanadaIllinois State Geological Survey, University of Illinois, Urbana–Champaign, Illinois 61790-4400, USAU.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225, USADepartment of Geology, Ghent University, Ghent, BelgiumDepartment of Geology, Ghent University, Ghent, BelgiumDepartment of Geology, Ghent University, Ghent, BelgiumDepartment of Geology, Ghent University, Ghent, Belgium<p>The well-preserved Llandovery (lower Silurian) succession of Anticosti Island (Quebec, eastern Canada) contains an expanded Aeronian–Telychian boundary interval when compared to other coeval basins. This boundary interval on Anticosti Island also includes two of the most important Llandovery biogeochemical events, the late Aeronian and Valgu events. These two events were previously documented in the Jupiter and Chicotte formations through the study of conodont, graptolite, and brachiopod biostratigraphy and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C chemostratigraphy. Despite these multiple investigations, the exact position of the Aeronian–Telychian stage boundary on Anticosti Island has not been firmly established. Here we locally define and globally correlate chitinozoan biozones to refine the position of this stage boundary. The <i>Ancyrochitina ramosaspina</i> biozone, recognized in the Ferrum Member of the Jupiter Formation, correlates with the global <i>Conochitina alargada</i> biozone and indicates an Aeronian age. The <i>Eisenackitina dolioliformis</i> biozone suggests mostly a Telychian age for the Pavillon Member of the Jupiter Formation and the Chicotte Formation. Three new species are defined, namely <i>Conochitina asselinae</i> sp. nov., <i>Spinachitina glooscapi</i> sp. nov., and <i>Ancyrochitina wilsonae</i> sp. nov. (registration date: 4 December 2024, publication LSID: urn:lsid:zoobank.org:pub:11184506-F273-4D7A-BC28-A1BB4BC8FCD8, asselinae LSID: D282DA9D-6A9C-4B9E-AA6C-9ADC4473E95B, glooscapi LSID: 5801DC12-4EA1-439F-B7C8-FAF7C1B9D2C7, wilsonae LSID: 549EEF2F-7F19-4E6D-9F8E-384594B2FE65). Our new chitinozoan data, combined with previous studies, allow a comparison with the well-studied Baltic succession, confirming that limited unconformities mark the Aeronian–Telychian boundary interval on Anticosti Island, in contrast to the less complete coeval location. Our refined age model for the Aeronian to Telychian succession of Anticosti Island provides a solid baseline to study further Llandovery biochemical events in the aftermath of the Late Ordovician mass extinction.</p>https://jm.copernicus.org/articles/43/475/2024/jm-43-475-2024.pdf |
| spellingShingle | C. Klock A. Desrochers P. I. McLaughlin P. Emsbo T. De Backer F. M. Jonckheere C. J. P. Esteves T. R. A. Vandenbroucke Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada Journal of Micropalaeontology |
| title | Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada |
| title_full | Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada |
| title_fullStr | Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada |
| title_full_unstemmed | Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada |
| title_short | Chitinozoan biostratigraphy through the Aeronian–Telychian boundary interval on Anticosti Island, Canada |
| title_sort | chitinozoan biostratigraphy through the aeronian telychian boundary interval on anticosti island canada |
| url | https://jm.copernicus.org/articles/43/475/2024/jm-43-475-2024.pdf |
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