Abstract

A small conodont assemblage, obtained from a limestone marking the boundary between the middle and upper units of the Kuan Tung Formation, Satun Province, South Thailand, contains inter alia Pandorinellina steinhornensis steinhornensis, Polygnathus labiosus mawsonae n.subsp., and Pseudooneotodus kuangtungensis n.sp., indicating an Emsian age (perbonus-serotinus Zones). Studies on ontogenetic variation in Pa elements of Polygnathus labiosus mawsonae n.subsp. show that smaller Pa elements have fewer transverse ridges on the posterior third of the platform, more distinct marginal denticulation on the platform and a proportionately smaller basal cavity. The basal cavity lips may break off in mature specimens; this gives an appearance of a small basal cavity. The distribution of P. labiosus, P. pseudoserotinus, P. perbonus and Pseudooneotodus kuantungensis n.sp., in the Shan-Thai and South China Terranes, together with supporting evidence from thelodontid and placoderm fishes, suggests that these terranes were in close proximity to the eastern margin of Gondwana at the end of the Early Devonian.

 
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Bibliographic Data

Short Form
Long and Burrett, 1989, Rec. Aust. Mus. 41(2): 121–133
Author
John A. Long; C. F. Burrett
Year
1989
Title
Early Devonian conodonts from the Kuan Tung Formation, Thailand: systematics and biogeographic considerations
Serial Title
Records of the Australian Museum
Volume
41
Issue
2
Start Page
121
End Page
133
DOI
10.3853/j.0067-1975.41.1989.140
Language
English
Date Published
22 September 1989
Cover Date
22 September 1989
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
DEVONIAN: EARLY; CONODONTS
Digitized
20 September 2007
Available Online
04 March 2009
Reference Number
140
EndNote
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Title Page
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File size: 87kB
Complete Work
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