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1 July 2013 A New Middle Ordovician Conodont Fauna from the Thong Pha Phum Area of Western Thailand
Sachiko Agematsu, Katsuo Sashida, Apsorn Sardsud
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Little is known about Ordovician litho- and biostratigraphy in northern and western Thailand because outcrops are scarce in these mountainous areas. Biostratigraphic and biogeographic studies of conodonts are limited to the uppermost Floian to lower Darriwilian strata in western Thailand. This paper describes and discusses a new Middle Ordovician conodont fauna that includes nine species from the Thong Pha Phum area of western Thailand. This is the first report of Eoplacognathus suecicus, Pygodus lunnensis, Protopanderodus calceatus, Protopanderodus cooperi, and Protopanderodus graeai in Thailand and indicates that a cool-water fauna existed in western Thailand and in southern peninsular Thailand during the Middle to Late Ordovician. The Dapingian to early Darriwilian sea-level rise likely resulted in an immigration of this “cooler or deeper water” fauna to the Thong Pha Phum area.

© by the Palaeontological Society of Japan
Sachiko Agematsu, Katsuo Sashida, and Apsorn Sardsud "A New Middle Ordovician Conodont Fauna from the Thong Pha Phum Area of Western Thailand," Paleontological Research 17(2), 179-188, (1 July 2013).
Received: 2 May 2012; Accepted: 1 September 2012; Published: 1 July 2013
Middle Ordovician
western Thailand
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