Late Devonian to early Carboniferous radiolarian faunas from the Ban Wang Pha chert section in Pak Chom district, Loei province, northeastern Thailand

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Sirakan Janya

Abstract

Abstract


Some of Devonian radiolarian chert sequences have been previously reported from the Loei Fold Belt. However, various chert sequences exposed in Loei province have not yet been studied. The chert sequence exposed at a hill located behind the Ban Wang Pha School was selected in this study. More than 30 chert samples were collected from the rock section. Standard chemical method was applied by using 3-5 % hydrofluoric acid for radiolarian extraction. As the result, these Devonian radiolarias can be classified into 9 genera and 17 species. These faunas can be grouped into 2 assemblages. The first assemblage: Polyentactinia tenera Assemblage includes Polyentactinia tenera, P. invenusta, Ceratoikiscum sp. cf. C. bujugum and Trilonche sp. cf. T. vachardi and other, indication of Late Devonian (Frasnian-Famennian). The second assemblage: Belowea variabilis Assemblage including Belowea variabilis, Trienosphaera sicarius, Archocyrtium sp. and Stigmosphaerostylus sp. cf. S. variospina and other. This assemblage was indicated the age of Late Devonian (Famennian) to early Carboniferous.

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References

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