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Devonian rocks are exposed in every region of Thailand, commonly occurring in thick sequences of Lower to Upper Palaeozoic sedimentary and volcanic rocks (Fig. 4.1). However, a scarcity of marker fossils and generally discontinuous exposures have meant that Devonian rocks are frequently not distinguishable from older and younger rocks. In such cases, the Department of Mineral Resources (the DMR) have inferred Devonian rocks to be present and have mapped them as Silurian-Devonian, Silurian-Carboniferous, or Devonian-Carboniferous (DMR 1999).

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