Abstract

Discovery of Serratognathus bilobatus in the Early Ordovician Emanuel Formation of the Canning Basin, Western Australia, has regional biogeographic and biostratigraphic implications. Distribution of Serratognathus indicates a close biogeographic link between Australia and adjacent eastern Gondwanan plates and terranes during the latest Tremadocian to early Floian (Early Ordovician), and the formation of the so-called "Australasian Province", a distinctive biogeographic entity that existed throughout most of the Ordovician. The S. bilobatus fauna from the Canning Basin is much more diverse in comparison with those assemblages bearing Serratognathus from coeval Chinese Lower Ordovician successions and probably represents an assemblage inhabiting relatively deeper water (mid-outer shelf) environments. The Canning Basin fauna contains many pandemic forms, and bridges the gap in the regional correlation of this widely distributed fauna across eastern Gondwana.

This well-preserved, diverse fauna includes Serratognathus bilobatus and 23 associated species: Acodus deltatus?, Acodus? transitans, Bergstroemognathus extensus, Cornuodus sp., Drepanodus arcuatus, Drepanoistodus sp. cf. D. nowlani, Fahraeusodus adentatus, Lissoepikodus nudus, Nasusgnathus dolonus, Paltodus sp., Paracordylodus gracilis, Paroistodus parallelus, Paroistodus proteus, Prioniodus adami, Protopanderodus gradatus, Protoprioniodus simplicissimus, Scolopodus houlianzhaiensis, Semiacontiodus sp. cf. S. cornuformis, Stiptognathus borealis, Triangulodus bifidus, Tropodus australis, gen. et sp. indet. A and gen. et sp. B. A P. adami-S. bilobatus Biozone is defined within the middle and upper Emanuel Formation. Correlation of this biozone suggests an early Floian (late P. proteus Biozone to possibly earliest P. elegans Biozone) age for the middle and upper members of the Emanuel Formation.

 
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Bibliographic Data

Short Form
Zhen and Nicoll, 2009, Rec. Aust. Mus. 61(1): 1–30
Author
Yong Yi Zhen; Robert S. Nicoll
Year
2009
Title
Biogeographic and biostratigraphic implications of the Serratognathus bilobatus fauna (Conodonta) from the Emanuel Formation (Early Ordovician) of the Canning Basin, Western Australia
Serial Title
Records of the Australian Museum
Volume
61
Issue
1
Start Page
1
End Page
30
DOI
10.3853/j.0067-1975.61.2009.1520
Language
English
Date Published
27 May 2009
Cover Date
27 May 2009
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
CONODONTS; ORDOVICIAN: EARLY; PALAEONTOLOGY
Digitized
27 May 2009
Available Online
27 May 2009
Reference Number
1520
EndNote
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