A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe

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Standard

A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe. / Paulsen, Maria; Thibault, Nicolas; Fraguas, Ángela.

I: Lethaia: An International Journal of Palaeontology and Stratigraphy, Bind 56, Nr. 3, 56.3.4, 2023.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

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, bind 56, nr. 3, 56.3.4. https://doi.org/10.18261/let.56.3.4

APA

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

Vancouver

Paulsen M, Thibault N, Fraguas Á. A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe. Lethaia: An International Journal of Palaeontology and Stratigraphy. 2023;56(3). 56.3.4. https://doi.org/10.18261/let.56.3.4

Author

Paulsen, Maria ; Thibault, Nicolas ; Fraguas, Ángela. / A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe. I: Lethaia: An International Journal of Palaeontology and Stratigraphy. 2023 ; Bind 56, Nr. 3.

Bibtex

@article{e7abf641774c41b49f1f3fbaa28d97c2,
title = "A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe",
abstract = "The Mochras core, UK, an historic reference site for the study of Early Jurassic cal-careous 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.",
keywords = "Biostratigraphy, Coccoliths, Early Jurassic, Hettangian, Mochras Borehole, Pliensbachian",
author = "Maria Paulsen and Nicolas Thibault and {\'A}ngela Fraguas",
note = "Publisher Copyright: {\textcopyright} 2023 Author(s).",
year = "2023",
doi = "10.18261/let.56.3.4",
language = "English",
volume = "56",
journal = "Lethaia: An International Journal of Palaeontology and Stratigraphy",
issn = "0024-1164",
publisher = "Wiley-Blackwell",
number = "3",

}

RIS

TY - JOUR

T1 - A revised calcareous nannofossil biozonation for the Lower Jurassic (Hettangian–Lower Pliensbachian) of NW Europe

AU - Paulsen, Maria

AU - Thibault, Nicolas

AU - Fraguas, Ángela

N1 - Publisher Copyright: © 2023 Author(s).

PY - 2023

Y1 - 2023

N2 - The Mochras core, UK, an historic reference site for the study of Early Jurassic cal-careous 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.

AB - The Mochras core, UK, an historic reference site for the study of Early Jurassic cal-careous 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.

KW - Biostratigraphy

KW - Coccoliths

KW - Early Jurassic

KW - Hettangian

KW - Mochras Borehole

KW - Pliensbachian

U2 - 10.18261/let.56.3.4

DO - 10.18261/let.56.3.4

M3 - Journal article

AN - SCOPUS:85175418181

VL - 56

JO - Lethaia: An International Journal of Palaeontology and Stratigraphy

JF - Lethaia: An International Journal of Palaeontology and Stratigraphy

SN - 0024-1164

IS - 3

M1 - 56.3.4

ER -

ID: 382857935