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4) It is important to record the characteristics of the rock bedding, and then to interpret the effects of later structural modification on this succession of sedimentary strata. Siltstone deposited on a floodplain – the undulating surface of the floodplain is indicated by the slightly irregular fine laminae The contact relationship between finely bedded river channel sandstone and siltstone Siltstone deposited on a floodplain – iron staining developed during weathering has formed banding that can facilitate interpretation of local minor structures Horizontal bedding within a channel sandstone Cross bedding and disturbed bedding Sandstone lens (light colour) interbedded with siltstones 25
Sediments infilling a groove – transported mudstone fragments deposited in the eroded groove during a flood Folds in interbedded siltstone (dark colour) and sandstone (light colour) Comments Sedimentary dykes within sandy siltstone – before the sediments were lithified, the weight of the siltstone caused the underlying pebbly sand to liquefy and inject upwards into the siltstone Differential weathering in the interbedded silstone and sandstone – laminae or lenses of quartz sandstone are more resistance to weathering than the siltstone, so they protrude above the weathered rock surface Previously, the Tai O Formation was mistakenly assigned to the Carboniferous Mai Po Member of the Lok Ma Chau Formation, San Tin Group. In 1996, a geological survey team from the Civil <strong>Engineering</strong> and Development Department, the Polytechnic University, and the Nanjing Institute of <strong>Geology</strong> and Paleontology of the Chinese Academy of Sciences recovered numerous fossil plants from the siltstone and fine sandstone sequences along the seashore at Kau San Tei, Tai O (Lee et al., 1997). The assemblage of fossil plants was dominated by cycads, gingko, and Gymnosperms (conifers), as well as some Pteridophyta (ferns). The characteristics of the flora were correlated with those of the “Xiangxi Flora” from the Southern China, evidence that 26
Page 1 and 2: Hong Kong Geology Guide Book
Page 3 and 4: Hong Kong Geology Guide Book Geotec
Page 5 and 6: FOREWORD Despite having a relativel
Page 7 and 8: Table of Contents Page Preface 1 Fo
Page 9 and 10: 21. Power of Weathering - Erosion T
Page 11 and 12: Plover Cove Reservoir, Northeast Ne
Page 13 and 14: Outline of the Geology Geological M
Page 15 and 16: Conglomerate overlying horizontally
Page 17 and 18: Bureau of Geology and Mineral Resou
Page 19 and 20: How to Get There The Permian sedime
Page 21 and 22: Guide to Field Observations Because
Page 23 and 24: Comments Outcrops of Permian rocks
Page 25 and 26: Kau San Tei, Tai O, Lantau Island I
Page 27: ock make up 95% of the Formation. I
Page 31 and 32: Lai Chi Chong, East New Territories
Page 33 and 34: Footpath from Pak Sha O to Lai Chi
Page 35 and 36: Guide to Field Observations The opt
Page 37 and 38: Newsletter, v. 4, pp 1-4. Sewell, R
Page 39 and 40: Outline of the Geology Exposures of
Page 41 and 42: Formation Rock Type Depositional En
Page 43 and 44: East Ping Chau, Eastern New Territo
Page 45 and 46: The dolomitic siltstone, particular
Page 47 and 48: Study of the rock outcrops, particu
Page 49 and 50: Tai Shek Mo, Lo Wu, Northern Territ
Page 51 and 52: contact with the Jurassic Tai Mo Sh
Page 53 and 54: Comments In addition to extensive e
Page 55 and 56: Tsing Shan Monastery, Tuen Mun, Wes
Page 57 and 58: Ling Tao Monastery is best reached
Page 59 and 60: and may have been formed by small-s
Page 61 and 62: these outcrops stand out prominentl
Page 63 and 64: References Rock cores with marble c
Page 65 and 66: Ho Tin Tsuen Service Reservoir, Tue
Page 67 and 68: Brecciated andesite near Tuen Mun N
Page 69 and 70: contains very few brecciated clasts
Page 71 and 72: Shek Lung Kung, Tsuen Wan Chapter 1
Page 73 and 74: with some quartzite or chert debris
Page 75 and 76: Comments The Repulse Bay Formation,
Page 77 and 78: Tai Mo Shan, New Territories Introd
Page 79 and 80:
and quartz, with minor biotite mica
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taken on rock outcrops, and not on
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Nei Lak Shan, Ngong Ping, Lantau Is
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which crop out on the lower part of
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are represented by faults, which su
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Silverstrand Bay / HKUST, Sai Kung,
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Welded tuff, eastern side of Silver
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Comments During the geological surv
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Cape Collinson Road, Siu Sai Wan, H
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Tuff-breccia (1) Tuff-breccia (2) T
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References Allen, P. M. & Stephens,
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Outline of the Geology Access to Lu
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Water Bay Formation, Kau Sai Chau V
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pp 1053-1066. Sewell, R.J., Campbel
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Outline of the Geology Access to th
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1) At the base of many of the rock
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plus 14 plates & 3 maps. Fisher, R.
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lapilli crystal tuff of the Jurassi
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Mafic dyke with xenoliths of quartz
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Evolution of a headland, and the fo
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Sham Shui Kok, Lantau Introduction
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Geological map of Sham Shui Kok (fr
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within the feldsparphyric rhyolite,
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Sketch of Phase II dykes at Penny
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Li, X.C., Sewell, R.J. & Fletcher,
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How to Get There Buses from Tung Ch
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Joint pattern in Tong Fuk Quartz Mo
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and the Lion Rock Suite. A total of
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How to Get There The type locality
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Pegmatite vein formed in the pluton
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References Allen, P. M. & Stephens,
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in the properties and appearance of
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emains of weathering profiles becom
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piping, rilling and gullying. Hong
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pace for about half an hour. Pyrami
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Stacked stones covering a valley Er
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“Broken tortoise head” should b
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Lam Tsuen Valley, Tai Po, New Terri
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Outline of the Geology The Lam Tsue
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(Looking southwestward toward Lam T
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References Addison, R. 1986. Geolog
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Sha Tin, Ma On Shan, East New Terri
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silicon and aluminium selectively t
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open mining platform, which is loca
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Appendix I Outline History and Geol
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500 m in a NE-SW orientation at an
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haulage drive at the 110 m level. T
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Current condition of Ma On Shan min
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Mineral Origin and Occurrence Hardn
Page 177:
Mineral Origin and Occurrence Hardn
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