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Late Ordovician limestones of the Pa Kae and uppermost Tha Manao Formations (approximately mid-Sandbian to late Katian Stages) of western Sibumasu Terrane in Thailand comprise micritic limestone with abundant bioclasts of fragile fossils, in deep water facies. Both formations have a distinctive Fe–Mn-rich polygonal network vein system containing bioclasts and nodules of micrite. Pa Kae limestones,...