18 Microscopic study of a calc-silicate rocks sample collected from Sungai Bahoi (05 o 25′ 24″ N, 101 o 01′ 14″ E) shows that the calc-silicate is epidote-diopsidevesuvianite hornfels. The calcareous facies This unit is composed of lenticular bodies of limestone (often metamorphosed to marble) and other calcareous rocks. The limestone is light to dark grey in colour, thick bedded to massive, carrying a large quantity of non-carbonate impurities. It is frequently platy and bedded owing to the post-depositional segregation of argillaceous impurities from the carbonate. Coarse-grained crystalline marble occurs in the vicinity of the granite margin especially in the Belukar Semang area where it is in contact with the calc-silicate member. The calcareous facies generally shows a very restricted vertical-lateral distribution in which the development of features of karst topography was insufficient. However, minor karst topography can be seen in the Tanah Hitam, Belukar Semang and Kampung Pong areas. On the Thai side, the Silurian-Devonian Kroh formation/Betong Formation (SDkr/bt) consists mainly of very thin- to thin-bedded shale, siltstone, lithic sandstone with subordinate chert and argillaceous limestone lenses. Local metamorphism by Si Nakhon (Trgrsn) granite resulted in the rocks becoming slate or phyllite. The lower part of the formation displays good outcrops along the road-cut from the Malaysia-Thailand border to Betong District and from Km 4 village to Bo Nam Ron village. The rocks consist of interbedded layers of very thin- to thin-bedded, laminated, grey to dark grey mudstone and silicified shale to very fine-grained sandstone. The middle part is well exposed on the road-cuts along the border to Betong District i.e. in Ku Nung Chanong and Ka Pae villages. Other localities are situated at the rock aggregate quarry in Bo Nam Ron village, Km 4 to Km 8, and Km 19 villages along the Yala-Betong road. The rocks consist of very thin- to thin-bedded, laminated, grey to dark grey mudstone interbedded with silicified shale to very fine-grained sandstone and thinbedded, laminated, friable, porous, and light pink shale with Tentaculites sp., trilobite, and graptolite. The lenses of thin- to medium-bedded, argillaceous limestone and dark grey shale (stylolite) are intercalated in the upper part of the sequence from 4 – 20 m in thickness. The upper part is represented by good outcrops in the road-cuts of the Suan Som-Ai Yoe Boe Chang villages, near the border and the eastern part of Betong District. Other localities are also exposed at the road-cuts in Ban Piyamit III village. The succession consists of interbedded layers of very thin- to thin-bedded, laminated, dark grey to black mudstone, silicified shale, very fine-grained sandstone and thin-bedded to ribbon, brown to grey chert with rare radiolarians and locally, limestone lenses. The thin-bedded, laminated, friable, porous, light pink shale with Tentaculites is partly intercalated in the upper part of the sequence from 2 – 5 m in thickness. The rock displays moderately developed S1 cleavage in the N-S direction with general dip towards east, and kink bands are generally recognized. The total thickness of the Silurian-Devonian rocks from the representative section exceeds 100 m.
A B Figure 8: Argillaceous facies of the Kroh formation/Betong Formation (SDkr/bt). A - Kroh formation at Kampung Pahit Dalam, Pengkalan Hulu, Malaysia B - Betong Formation near Betong, Thailand A Figure 9: Fossils in the argillaceous facies of the Kroh formation/Betong Formation (SDkr/bt) on the Malaysian side of the Transect area. A- Spirograptus in the argillaceous facies at Sungai Rui, near Kampung Pahit, Malaysia. B- Brachiopod and Fenestella, at border security road, Malaysia. B 19
- Page 5 and 6: GEOLOGY OF THE PENGKALAN HULU-BETON
- Page 7 and 8: PREFACE This report together with t
- Page 9 and 10: Geology of the Pengkalan Hulu-Beton
- Page 11: granite (Trgrbp/pr) and Kawi granit
- Page 14 and 15: x LIST OF FIGURES Page Figure 1: Lo
- Page 17 and 18: 1. INTRODUCTION The Malaysia-Thaila
- Page 19 and 20: On the Thai side, detailed systemat
- Page 21 and 22: Basir Jasin (1995) reported the occ
- Page 23 and 24: Permian as indicated by the presenc
- Page 25 and 26: Central - North Peninsular Malaysia
- Page 27 and 28: The Permian Ratburi Group (Prb), un
- Page 29 and 30: Figure 5: General succession of the
- Page 31 and 32: Era CENOZOIC MESOZOIC P A L A E O Z
- Page 33: strong isoclinal folding, faulting,
- Page 37 and 38: Fossils and age According to the ea
- Page 39 and 40: metaconglomerate occurs in the uppe
- Page 41 and 42: The lower part of the formation is
- Page 43 and 44: Figure 14: Stratigraphic sequence o
- Page 45 and 46: A Figure 16: Photographs showing th
- Page 47 and 48: the banks of small rivers and strea
- Page 49 and 50: Figure 18: Stratigraphic sequence o
- Page 51 and 52: A C Figure 20: Photographs of the u
- Page 53 and 54: Lithology The Tham Krachaeng format
- Page 55 and 56: 3.1.4 The Gerik formation (Pgk) The
- Page 57 and 58: Small amounts of interbedded sedime
- Page 59 and 60: Depositional environment Based on t
- Page 61 and 62: nomenclature of the Nenering beds (
- Page 63 and 64: A B Figure 33: Exposures of the Nen
- Page 65 and 66: A B Figure 35: Outcrop of Basal Gra
- Page 67 and 68: The rock sequence of the Nenering b
- Page 69 and 70: 3.3.1 Rimba Telui/Si Nakhon granite
- Page 71 and 72: 3.3.2 Bintang granite (Trgrbt) Dist
- Page 73 and 74: A B Figure 41: The Chantharat grani
- Page 75 and 76: intrusion of the granitoids mention
- Page 77 and 78: The Silurian-Devonian rock sequence
- Page 79 and 80: 5.2 Metallic Minerals The occurrenc
- Page 81 and 82: arsenopyrite and grossularite are c
- Page 83 and 84: British American Tin Mines Company
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5.3 Non-Metallic Minerals and Hot S
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Figure 50: Limestone quarry at Buki
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Ban Bor Nam Ron, 9 km north of Beto
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well-cemented, poorly sorted matrix
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Foo, K.Y., 1990. Geology and Minera
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Sashida, K., Nakornsri, N., Ueno, K
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Appendix 1: List of the Malaysian W
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Appendix 3: XRD analysis results fo
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