New Biochronological Scales of Planktic Foraminifera for the Early Danian Based on High-Resolution Biostratigraphy
After the Cretaceous/Paleogene boundary (KPB) catastrophic mass extinction event, an explosive evolutionary radiation of planktic foraminifera took place in consequence of the prompt occupation of empty niches. The rapid evolution of new species makes it possible to establish high-resolution biozona...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/25620b180f7c4fd99991b3af40eacacc |
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| Sumario: | After the Cretaceous/Paleogene boundary (KPB) catastrophic mass extinction event, an explosive evolutionary radiation of planktic foraminifera took place in consequence of the prompt occupation of empty niches. The rapid evolution of new species makes it possible to establish high-resolution biozonations in the lower Danian. We propose two biostratigraphic scales for low-to-middle latitudes spanning the first two million years of the Danian. The first is based on qualitative data and includes four biozones: the <i>Guembelitria cretacea</i> Zone (Dan1), the <i>Parvularugoglobigerina longiapertura</i> Zone (Dan2), the <i>Parvularugoglobigerina eugubina</i> Zone (Dan3), and the <i>Parasubbotina pseudobulloides</i> Zone (Dan4). The latter two are divided into several sub-biozones: the <i>Parvularugoglobigerina sabina</i> Subzone (Dan3a) and the <i>Eoglobigerina simplicissima</i> Subzone (Dan3b) for the <i>Pv. eugubina</i> Zone, and the <i>Praemurica taurica</i> Subzone (Dan4a), the <i>Subbotina triloculinoides</i> Subzone (Dan4b), and the <i>Globanomalina compressa</i> Subzone (Dan4c) for the <i>P. pseudobulloides</i> Zone. The second scale is based on quantitative data and includes three acme-zones (abundance zones): the <i>Guembelitria</i> Acme-zone (DanAZ1), the <i>Parvularugoglobigerina-Palaeoglobigerina</i> Acme-zone (DanAZ2), and the <i>Woodringina-Chiloguembelina</i> Acme-zone (DanAZ3). Both biozonations are based on high-resolution samplings of the most continuous sections of the lower Danian worldwide and have been calibrated with recent magnetochronological and astrochronological dating. |
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