Journal of Micropalaeontology
Journal of Micropalaeontology
JM
Articles | Volume 44, issue 2
Articles | Volume 44, issue 2
https://doi.org/10.5194/jm-44-469-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-44-469-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 44, issue 2
Research article
 | 
03 Nov 2025
Research article |  | 03 Nov 2025

Biometric insights on the calcareous nannofossil genus Aspidolithus across the Santonian–Campanian boundary: Western Interior (Niobrara, USA) vs. Tethys (Loibichl and Postalm, Austria) sections

Paula Granero, Michael Wagreich, Adam Wierzbicki, and David Watkins

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Short summary
We present a morphometric study of the calcareous nannofossil Aspidolithus across the Santonian–Campanian boundary, based on material from the Western Interior (USA) and the Tethys (Austria). The results reveal that size variation correlates with sea surface temperature. These findings have implications for the taxonomy, palaeoecology, and biostratigraphy of Upper Cretaceous planktonic assemblages.
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