Abstract

Forty-four conodont species are documented from the Dawangou section in the Tarim Basin, which spans the Darriwilian to Sandbian interval and is the global auxiliary stratotype for the base of the Upper Ordovician. Five conodont zones are recognized in this section, including the Yangtzeplacognathus crassus, Histiodella holodentata and H. kristinae zones in the upper part of the Dawangou Formation, the Pygodus anserinus Zone from the upper part of the Saergan Formation to the lower part of the Kanling Formation, and the Baltoniodus alobatus Zone in the upper part of the Kanling Formation. Presence of the P. serra Zone is based on occurrences of this species on shale bedding planes in the lower and middle Saergan Formation, but could not be confirmed in acid-leached samples studied from this interval. The Middle/Upper Ordovician boundary occurs within graptolitic black shale of the upper Saergan Formation. Although the boundary interval was intensively sampled, conodonts were very rare, probably due to stagnant or stratified basinal environments. This documentation of the conodont faunas and biostratigraphy of the Dawangou section is considered preliminary and more detailed conodont studies are required, but the remoteness of the site hinders the further extensive sample collection needed for this purpose.

 
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Bibliographic Data

Short Form
Zhen et al., 2011. Rec. Aust. Mus. 63(3): 203–266
Author
Yong Yi Zhen; Zhihao Wang; Yuandong Zhang; Stig M. Bergström; Ian G. Percival; Junfeng Cheng
Year
2011
Title
Middle to Late Ordovician (Darriwilian-Sandbian) conodonts from the Dawangou section, Kalpin area of the Tarim Basin, northwestern China
Serial Title
Records of the Australian Museum
Volume
63
Issue
3
Start Page
203
End Page
266
DOI
10.3853/j.0067-1975.63.2011.1586
Language
English
Date Published
01 December 2011
Cover Date
01 December 2011
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
CONODONTS; PALAEONTOLOGY; ORDOVICIAN
Digitized
01 December 2011
Available Online
01 December 2011
Reference Number
1586
EndNote
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