Australian Museum Journal Biogeographic and biostratigraphic implications of the Serratognathus bilobatus fauna (Conodonta) from the Emanuel Formation (Early Ordovician) of the Canning Basin, Western Australia

Shortform:
Zhen and Nicoll, 2009, Rec. Aust. Mus. 61(1): 1–30
Author(s):
Zhen, Yong Yi; Nicoll, Robert S.
Year published:
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 package:
EndNote file
Title page:
Title page (48kb PDF)
Complete work:
Complete work (2067kb PDF)

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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