A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe
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2023
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Scandinavian University Press
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The Mochras core, UK, an historic reference site for the study of Early Jurassic calcareous
nannofossils, has been reinvestigated here across the Hettangian to Lower
Pliensbachian. Both relative and absolute abundances of 24 calcareous nannofossil species
reveal patterns and occurrences that define not less than 37 defined biohorizons.
However, due to the low abundance of many of those species towards the base and top
of their stratigraphical range, we observe large inconsistencies in first and last occurrences
of these species. Instead, we consider records of first consistent and last consistent
occurrences (FCOs and LCOs), as well as base and top of acme events, as more reliable
biohorizons. Accordingly, we assess the reliability of our biohorizons and show that,
in addition to previously established zonal and sub-zonal biomarkers, nine non-zonal
biohorizons prove to be robust. Based on that, an updated biozonations scheme with
additional subzones for NJB has been proposed and tested against other localities.
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Paulsen, M., Thibault, N., & Fraguas, Á. (2023). A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe. Lethaia: An International Journal of Palaeontology and Stratigraphy, 56(3), [56.3.4]. https://doi.org/10.18261/let.56.3.4
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