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A new ammonite from the Penarth Group, South Wales and the base of the Jurassic System in SW Britain

Published online by Cambridge University Press:  16 October 2020

Peter Hodges Open the ORCID record for Peter Hodges [Opens in a new window]
Peter Hodges*
Affiliation:
Department of Geology (Palaeontology), Natural Sciences, National Museum of Wales, Cathays Park, CardiffCF1 3NP, UK
*
Author for correspondence: Peter Hodges, Email: peter.hodges@museumwales.ac.uk
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Abstract

Two ammonites have been found in porcelaneous limestones of the White Lias Formation traditionally considered to be of Rhaetian (Late Triassic) age at Lavernock Point, south Wales (ST 181 681). These ammonites, named here Neophyllites lavernockensis. sp. nov, are the earliest recorded from the UK. This horizon is located directly above a major negative δ13C isotope anomaly (CIE1) in the Upper Cotham Member that marks the top of the Triassic System and below another negative δ13C isotope anomaly (CIE3). Both correlate with negative δ13C isotope anomalies in the Triassic–Jurassic global boundary stratotype section and point (GSSP) at Kuhjoch, Austria. This establishes the base of the tilmanni Chronozone, Hettangian Stage and Jurassic System in SW Britain within the White Lias Formation at Lavernock Point.

Keywords

Lavernock Pointtilmanni ChronozoneNeophyllites
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 6 , June 2021 , pp. 1109 - 1114
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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