Abstract
The area was mapped on a scale of 1 :250 000 by the German Geological Mission from 1968 to 1971, by field mapping and airphoto interpretation. Strata in the area comprise about 3000 m of mostly marine metasedimentary and sedimentary rocks, whose age ranges from Cambrian to Jurassic, locally covered by flu viatile Cenozoic sediments. The marine sedimentary basin forms part of a geosynclinal tract which extends from Yunnan in the north to Malaysia in the south- the Yunnan Malaya Geosyncline. Tectonic activity is indicated by turbidites of Lower Carboniferous age, and a late Carboniferous phase is also indicated. There is also evidence for Triassic and Post-Jurassic orogenies, and late Cenozoic faulting. Several granites, as yet not positively dated, occur in the area. They are: Khwae Yai granite (Triassic?) ; Central granite (Paleozoic?); and Pi 10k granite (Triassic ?).
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