Abstract
Eleven Ordovician conodont species of nine genera from the Ban Tha Kradan area of western Thailand are described and illustrated here for the first time. Based on similar lithological features and stratigraphical range, the upper part of Tha Manao Formation in the Ban Tha Kradan area of Kanchanaburi Province is amended and assigned to the Pa Kae Formation. The Scolopodus striatus Assemblage Zone is recognized in the revised Tha Manao Formation in the Ban Tha Kradan area. Based on conodonts and macrofossils, the Tha Manao Formation in western Thailand is assigned to the upper Floian to Darriwilian, and the conformably overlying Pa Kae Formation to the Sandbian to lower Katian.
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