Early Ordovician trilobites from Barnicarndy 1 stratigraphic well of the southern Canning Basin, Western Australia

Patrick M. Smith, Heidi J. Allen

Research output: Contribution to journalArticlepeer-review

Abstract

Twenty-three trilobite taxa are described here from the Early Ordovician (Tremadocian to Floian) Nambeet Formation retrieved from the Barnicarndy 1 drillcore, Canning Basin, Western Australia. This includes one new genus, Veeversaspis gen. nov., and six new species: Asaphellus zheni sp. nov., Madiganaspis lauriei sp. nov., Norasaphus (Norasaphus) jagoi sp. nov., Rodingaia leggi sp. nov., Sanbernardaspis excalibur sp. nov., and Veeversaspis jelli gen. et sp. nov. This fauna can be divided into three stratigraphically distinct assemblages, the Apatokephalus sp.–Veeversaspis jelli gen. et sp. nov. Assemblage (2177.50–2382.94 m depth), Asaphellus trinodosus Assemblage (2030.07–2177.52 m depth), and Asaphellus zheni sp. nov. Assemblage (1595.83–2001.88 m depth). The two stratigraphically lowest assemblages are consistent with a late to latest Tremadocian age (both within the Paroistodus proteus Zone). The third, and highest, assemblage is consistent with a mid-Floian age (within the Oepikodus communis Zone). This systematic contribution refines previous biostratigraphic work based on an age-diagnostic conodont fauna and demonstrates the stratigraphic utility of using multiple taxonomic groups for more robust biostratigraphic age estimates. 

Original languageEnglish
Pages (from-to)234-291
Number of pages58
JournalAlcheringa
Volume47
Issue number3
Early online date7 Aug 2023
DOIs
Publication statusPublished - 2023

Bibliographical note

© 2023 Crown Copyright. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • biostratigraphy
  • Fly Flat Member
  • Nambeet Formation
  • Samphire Marsh Member
  • Trilobite

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