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Quantitative paleobiogeography of the Albian–Maastrichtian bivalves of Ariyalur, south India: impact of the northward movement of the Indian Plate
Mukhopadhyay, A.; Paul, S.; Poddar, A. (2023). Quantitative paleobiogeography of the Albian–Maastrichtian bivalves of Ariyalur, south India: impact of the northward movement of the Indian Plate. J. Earth Syst. Sci. 132(3): 116. https://dx.doi.org/10.1007/s12040-023-02134-w
In: Journal of Earth System Science. Indian Academy of Sciences: Bangalore. ISSN 0253-4126; e-ISSN 0973-774X
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| Auteurs | | Top |
- Mukhopadhyay, A.
- Paul, S.
- Poddar, A.
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| Abstract |
The paleobiogeographic affinity of the late Early to Late Cretaceous bivalves of the Cauvery Basin, India, has been debated for decades. While some studies have documented an affinity with the Austral province, others have suggested more similarity with the bivalve fauna of the East African province-subprovince. In the present study, we present an updated dataset of the Albian–Maastrichtian bivalves of the Ariyalur region of the Cauvery Basin. Records of the contemporaneous bivalves from the Austral province and the East African province-subprovince are also compiled from the global database and previous literature. Quantitative analyses suggest that the paleobiogeographic history of the Ariyalur bivalves is more complex than previously thought. Ariyalur bivalves were more similar to the bivalves of the Austral province in the Albian to middle Turonian. However, the paleobiogeographic affinity of the Ariyalur bivalves shifted towards the East African province-subprovince in the middle Turonian to Maastrichtian. This temporal shift is evident in different taxonomic levels and ecological groups. The northward movement of the Indian plate and the associated change in the relative distance between the provinces with the Ariyalur region may explain the observed temporal shift in the paleobiogeographic affinity. |
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