Citation

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Stait, K. & Druce, E.C., 1993. Conodonts from the Lower Ordovician Coolibah Formation, Georgina Basin, central Australia. BMR Journal of Australian Geology and Geophysics  13:4:293-322. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

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.
Google map showing geographic bounding box with values North bound -22.76 East bound 139.6 West bound 136.04 South bound -25.69
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Date (publication)

1993

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GA Publication
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Earth Sciences

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English

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North bound
-22.76
East bound
139.6
West bound
136.04
South bound
-25.69

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Unknown

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pdf

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2015-03-23

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