Depositional environment of the deep marine sequences including the Late Devonian chert/siliceous shale sequences from the Truong Son and the Loei Fold belts are of importance in order to discriminate their basin evolution and tectonic scenario.

Radiolarian dating of the selected sections along with geochemical discriminations include rare earth element (REE) and major element analyses ore applied for these aspects. In the central part of Lao PDR within the Truong Son Fold belt a new locality of Late Devonian radiolarian chert and siliceous shale outcrops in the Vilabouly area, Sepon district together with radiolarian-bearing siliceous shale from the Bon Phonxoi section approximately 100 km. further north were selected.

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