A New Early Silurian species of Trimerella (Brachiopoda

Craniata) from the Orange district, New South Wales

Ian G. Percival, A. J. Wright

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Trimerella australis, a new species of craniate brachiopod, is described from silicified material extracted from Early Silurian limestone in the Bowan Park district, 22 km west of Orange in central New South Wales. Accompanying conodonts of the Distomodus staurognathoides Zone indicate this unnamed unit is mid Llandovery (latest Aeronian to earliest Telychian) in age, and support correlation with the Cobblers Creek Limestone at the base of the Waugoola Group. As with most other occurrences of trimerellide brachiopods in the Late Ordovician and Early Silurian of the Lachlan Orogen, T. australis completely dominates its depauperate faunal associates of corals including Aphyllum? sp., cf. Axolasma sp. and cf. Halysites cratus Etheridge, 1904 , and very rare atrypide brachiopods. Although all specimens of T. australis are disarticulated, the community is interpreted as preserved essentially in situ, representing a very shallow water Benthic Assemblage 2 environment.
    Original languageEnglish
    Pages (from-to)111-120
    Number of pages10
    JournalProceedings of the Linnean Society of New South Wales
    Volume126
    Publication statusPublished - 2005

    Keywords

    • Benthic Assemblage
    • biostratigraphy
    • Brachiopoda
    • Craniata
    • early Silurian
    • halysitid
    • tetracorals
    • trimerellide

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