Abstract

Thirty species (representing 19 genera) of Early Ordovician conodonts are described and illustrated from Mount Arrowsmith and Koonenberry Gap in the northwestern part of New South Wales. One new genus, Cooperignathus, and the new species Oepikodus pincallyensis, are established. Acodus sp. cf. emanuelensis predominates in 35 samples from the Tabita Formation and upper beds of the underlying Yandaminta Quartzite at Mount Arrowsmith, associated with ramiform and pectiniform taxa including species of Cooperignathus, Prioniodus, Oepikodus, Erraticodon, and Baltoniodus. The Koonenberry Gap fauna is dominated by coniform species, particularly Protopanderodus nogamii, P. gradatus, and Scolopodus multicostatus. Both faunas span an age range from latest Bendigonian to Chewtonian (evae Zone); their compositional differences are probably related to slight variations in water depths and depositional environments. Species endemic to the shallow water Australian cratonic region, represented by Bergstroemognathus kirki, Triangulodus larapintinensis, Acodus sp. cf. emanuelensis and Prioniodus sp. cf. amadeus, support a correlation with Early Ordovician faunas of central and western Australia, particularly those from the lower Horn Valley Siltstone of the Amadeus Basin. Biogeographically significant species in the western New South Wales faunas include Cooperignathus nyinti, C. aranda and Scolopodus multicostatus, which provide linkages with counterparts in North America and South China. Cosmopolitan elements in the documented collections are represented by Cornuodus longibasis, Drepanoistodus basiovalis, and Scolopodus quadratus. Only one species, Scalpellodus latus, from Mount Arrowsmith appears to be otherwise confined to Baltoscandia (northern Europe).

 
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Bibliographic Data

Short Form
Zhen et al., 2003, Rec. Aust. Mus. 55(2): 169–220
Author
Yong Yi Zhen; Ian G. Percival; Barry D. Webby
Year
2003
Title
Early Ordovician conodonts from far western New South Wales, Australia
Serial Title
Records of the Australian Museum
Volume
55
Issue
2
Start Page
169
End Page
220
DOI
10.3853/j.0067-1975.55.2003.1383
Language
English
Date Published
13 August 2003
Cover Date
13 August 2003
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
ORDOVICIAN: EARLY; CONODONTS; PALAEONTOLOGY
Digitized
13 August 2003
Available Online
13 August 2003
Reference Number
1383
EndNote
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