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The history of this geosyncline is divided into three stages: (1) Devonian and older ; (2) late Devonian to middle Triassic; and (3) la ter Mesozoic period. The socalled Pre-Cambrian metamorphic rocks require a further confirmation of their ages Upper Cambrian is the oldest dated sediment of the geosyncline. Three facies named Shihtien, Naungkangyi, and Thungson, can be distinguished in the Ordovician formation. In the later Palaeozoic sequence carbonate-rich and carbonate-poor facies alternatedoi:10.7186/bgsm06197308 fatcat:rujqswlm6bcofpmztzoppgklty