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Conodonts from the Lower Ordovician Coolibah Formation, Georgina Basin, central Australia

Created 17/10/2025

Updated 17/10/2025

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The Coolibah Formation outcropping around the Toko Syncline, southeastern Georgina Basin, was sampled for conodonts during a multidisciplinary study of Georgina Basin geology by the Australian Geological Survey organisation. Twenty-two species of conodonts belonging to 17 genera recovered from acid insoluble residues are described. Alcoorina and Tokoconus are new genera; Alcoorina nadala, Bergstroemognathus kirki and Tokoconus wheelamanensis are previously undescribed species. Four species remain in open nomenclature awaiting more material. The conodont faunas are grouped into three broad biostratigraphic associations, although few sections record all three. Faunas low in the Coolibah Formation are dominated by Drepanoistodus costatus (Abaimova) and Scolopodus multicostatus Barnes and Tuke, with Diaphorodus tortus (McTavish), Scandodus sp. nov. A and hyaline conical elements. The succeeding conodont association records first appearances of Ansella fengxiangensis (An and others). Aurilobodus? leptosomatus An. Paroistodus originalis (Sergeeva). Protoprioniodus nyinti Cooper. and Triangulodus larapintinensis (Crespin). Specimens of younger species are found in the uppermost Coolibah Formation. Examination of these associations within different sections indicates that both upper and lower contacts of the Coolibah Formation are probably diachronous. Recovered conodonts are closest in affinity to those of North China, and North and South Korea. They range in age from middle to late Arenig.

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Field Value
Title Conodonts from the Lower Ordovician Coolibah Formation, Georgina Basin, central Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/756de1b2-9106-41c2-822c-c0faba0f48e2
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Conodonts from the Lower Ordovician Coolibah Formation, Georgina Basin, central Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/conodonts-from-the-lower-ordovician-coolibah-formation-georgina-basin-central-australia