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... uarnom-sainn s^usitfm ninun-jom in-»n::ii*Tatn\>fiu«-w •) m^inü inunÜMuoariiuil |JiSuuliiiia-iu-aiiJ-izmoi i 0 Iuü-j: mflltiu iwaa'-rj-aaua:fln»niiaya»n>3 i >j i5uu*ifl-jDijijnma:^3mnij9-3 lüuain jb-i «bboutäuIubt uariimn-miUfi Su^in iMaum->lmiijrmu. CONTENTS I Abstracts 9 II Zusammenfassung 11 III Preface 23 IV Introduction 25 PARTI Facies development in the Permian Petchabun Basin, Central Thailand. 1. Geology and stratigraphy of Northern and Central Thailand ... 31 1.1. Plate tectonic discussion 36 2. New research 43 2.1. Saraburi -Pak Chong area 49 2.2. Saraburi -Lop Buri area 53 2.3. Saraburi -Lam Na Rai area 53 2.4. Thuak Khao Sompot area 56 2.5. Khok Samrong -Tak Fa area 59 2.6. Phu Khao Samo Rat area 61 2.7. Khao Khi Nok area 63 2.7.1. Silicification processes 65 2.8. Khao Yang Ta Po area 67 2.9. Ban Sapsamothot area 69 2.10. West of Nong Pai area 70 2.11. Nong Pai -Chon Daen area 71 2.12. Petchabun area 2.13. The Petchabun Fold and Thrust Belt 2.13.1. East of Lom Kao area 2.13.2. Huai Nam Lao area (east of Petchabun) 2.13.3. East of Nong Pai area 2.13.4. East of Wichian Buri area 2.14. Khao Tha Mon area 2.15. West of Chum Phae area 2.16. Wang Saphung area 2.17. Loei area 89 2.17.1. Loei -Dan Sai road 89 2.17.2. Loei -Tha Li road 90 2.17.3. Loei -Chiang Khan area 2.17.4. West of Chiang Khan area 92 2.17.5. East of Chiang Khan area 95 3. Volcanic rocks 96 3.1. XRF -Analysis and discussion 99 3.2. Description of thin sections 113 4. Upper Paleozoic facies development in Central Thailand 4.1. Carboniferous 4.2. Early Permian 4.3. Middle Permian 4.4. Late Permian 4.5. Discussion PART II The pebbly mudstone facies in peninsular Thailand and western Malaysia 1.