Additional occurrence report on early Carboniferous radiolarians from southern peninsular Thailand

Moderately-preserved radiolarians have been identified from black chert interbedded with layers of mediumto coarse-grained sandstone and variegated siliceous shale outcropped at a quarry near Ka Bang, Songkhla Province, southern peninsular Thailand. The following radiolarians (13 species belonging to seven genera) were identified and systematically investigated: namely Albaillella sp., Ceratoikiscum sp., Stigmosphaerostylus variospina, Stigmosphaerostylus cfr. vulgaris, Stigmosphaerostylus cfr. delvolei, Stigmosphaerostylus sp., Stigmosphaerostylus? sp. A, Stigmosphae-rostylus? sp. B, Stigmosphaerostylus? sp. C, Trilonche? sp., Spongentactnia exilispina, Pylentonema antiqia, and Archocyrtium sp. These radiolarians indicate the Tournaisian–Visean, Mississippian (early Carboniferous) in age. The present authors have already reported a Tournaisian radiolarian fauna which is slightly older than the present fauna from black bedded chert in the Saba YoiKabang area. This is an additional report on the occurrence of early Carboniferous radiolarians from southern peninsular Thailand. The radiolarian-bearing chert reported in this study may have been deposited in the upper continental rise to open deep-sea basins within the Paleotethys Ocean on the basis of the lithological and radiolarian characteristics.

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