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The Ninth Regional Congress on Geology, Mineral andEnergy Resources of Southeast Asia was held in KualaLumpur of Malaysia in August of 1998. After the Con-gress, the author participated in the geological fieldexcursion and investigation in the Langkawi Islands,and noted that the Carboniferous-Permian rocks con-tain megaclasts of metamorphic and pegmatitic rocks,which indicate the existence of pre-Carboniferousmetamorphism and magmatism. The observation resultsare as follows:
The Ninth Regional Congress on Geology, Mineral and Energy Resources of Southeast Asia was held in Kuala Lumpur of Malaysia in August of 1998. After the Con-gress, the author participated in the geological fieldexcursion and investigation in the Langkawi Islands, and noted that the Carboniferous- Permian rocks con-tain megaclasts of metamorphic and pegmatitic rocks, which indicate the existence of pre-Carboniferousmetamorphism and magmatism. The observation resultsare as follows: