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

Autor:	Peter Hodges
Rok vydání:	2020
Předmět:	Ammonite Horizon (archaeology) Geology 010502 geochemistry & geophysics 01 natural sciences language.human_language Global Boundary Stratotype Section and Point Paleontology Stage (stratigraphy) Group (stratigraphy) language Chronozone 010503 geology 0105 earth and related environmental sciences
Zdroj:	Geological Magazine. 158:1109-1114
ISSN:	1469-5081 0016-7568
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0d0dfc7363be7f10fce2306b8c0050b https://doi.org/10.1017/s0016756820001107 Zobrazit plný text záznamu