Middle to Late Ordovician age for the Jindalee Group of the Lachlan Fold Belt, New South Wales

conodont evidence and some tectonic implications

P. Lyons, I. G. Percival

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    The first definitive evidence for a late Middle to early Late Ordovician age for the Jindalee Group comes from identification of conodonts, including Periodon aculeatus, preserved in chert from an exposure northeast of Cootamundra, New South Wales. In the Grenfell area, the Hoskins Chert, a constituent formation of the Jindalee Group, also yields conodonts of the same general age, although no diagnostic species have been recognised. Conodonts found in the Jindalee Group, along with a distinctive fossil flora of probable cyanobacterial filaments, are similar to those of the Mugincoble Chert in the vicinity of Parkes. Age correlation of the Jindalee Group with the Girilambone Group is confirmed by the newly found conodonts, but at a much more precise level than previously inferred. However, the tectonic settings of the Jindalee and Girilambone Groups might have been quite distinct, with the Jindalee Group forming in an intra-arc rift and the Girilambone Group depositing in the backarc Wagga Marginal Basin.

    Original languageEnglish
    Pages (from-to)801-808
    Number of pages8
    JournalAustralian Journal of Earth Sciences
    Volume49
    Issue number5
    DOIs
    Publication statusPublished - 2002

    Keywords

    • Conodonts
    • Girilambone Group
    • Jindalee Group
    • Ordovician

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