A Late Devonian to Early Carboniferous radiolarian fauna is present in chert and siliceous shale of a chert-clastic section along the Khong River, Pak Chom area, at the Thai-Lao border of northeastern Thailand. The radiolarian fauna is composed of Stigmosphaerostylus variospina, Astroentactinia stellata, Astroentactinia multispinosus, Archocyrtium wonae, Archocyrtium riedeli, and other species and corresponds to the Famennian (Late Devonian) to Tournaisian (Early Carboniferous) radiolarian fauna reported from northwestern Europe, Australia, northern and southern Thailand, and southern China. Ten radiolarian species belonging to four genera including one unidentified genus are investigated. The radiolarian-bearing sequence was probably deposited in a pelagic or hemipelagic environment within the Paleotethys Ocean during Late Devonian to Early Carboniferous time. Furthermore, this chert-clastic section of Pak Chom area is thought to be deposited on the Nakhon Thai Block and subducted beneath the Indochina Block. This suggests that the age of subduction and accretion of the Naknon Thai Block is thought to have occurred at least after Early Carboniferous indicated by the occurrence of Late Devonian to Early Carboniferous radiolarians.
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