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Geology of the London Basin
Geology of the London Basin - 100 Million Years in the Making on 16 November 2018 Mr Philip Laurie first showed a geological map of London produced in 1848 by Stanford – the first of its kind. The Earth is 46,000 million years old, so much had happened before the London area made an appearance. The geological history of London started a hundred million years ago. For 60% of that time it has been under ice, causing sea levels to fall. He lives near the Ravensbourne, which rises south of the North Downs, runs through them and north to the Thames, emerging at Deptford Creek. How did it, and other rivers such as the Wandle, Darent and Medway, come to flow through the North Downs? At one time it was thought that there were faults in the chalk which gave them a way through, but this has been discounted. The Weald is now low lying, but when tectonic plate movement, mainly caused by Africa colliding with Europe, raised not only the Alps but buckled strata in northern Europe, a Wealden ridge was formed. An underlying chalk stratum buckled with high ridges at the South and North Downs and a dip under the Weald, squeezing up the soft sedimentary rocks between them to form the Ridge. Fast flowing streams from the ridge soon eroded channels in the chalk on their way to the sea. The ridge has since been eroding away (reducing river flows). They are ancient rivers. London is over a layer of cretaceous chalk about 40m down, which in turn is over gault clay. -
Geology of London, UK
Geology of London, UK Katherine R. Royse1, Mike de Freitas2,3, William G. Burgess4, John Cosgrove5, Richard C. Ghail3, Phil Gibbard6, Chris King7, Ursula Lawrence8, Rory N. Mortimore9, Hugh Owen10, Jackie Skipper 11, 1. British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK. [email protected] 2. Imperial College London SW72AZ, UK & First Steps Ltd, Unit 17 Hurlingham Studios, London SW6 3PA, UK. 3. Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, UK. 4. Department of Geological Sciences, University College London, WC1E 6BT, UK. 5. Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, UK. 6. Cambridge Quaternary, Department of Geography, University of Cambridge CB2 3EN, UK. 7. 16A Park Road, Bridport, Dorset 8. Crossrail Ltd. 25 Canada Square, Canary Wharf, London, E14 5LQ, UK. 9. University of Brighton & ChalkRock Ltd, 32 Prince Edwards Road, Lewes, BN7 1BE, UK. 10. Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK. 11. Geotechnical Consulting Group (GCG), 52A Cromwell Road, London SW7 5BE, UK. Abstract The population of London is around 7 million. The infrastructure to support this makes London one of the most intensively investigated areas of upper crust. however construction work in London continues to reveal the presence of unexpected ground conditions. These have been discovered in isolation and often recorded with no further work to explain them. There is a scientific, industrial and commercial need to refine the geological framework for London and its surrounding area. This paper reviews the geological setting of London as it is understood at present, and outlines the issues that current research is attempting to resolve. -
Outline • Background
Outline • Background Case Study 1 • Landslide Debris (Dorset) Case Study 2 • Engineering NIR Stratigraphy (Hampshire) Case Study 3 • Weathering - London Clay (London) NIR Spectroscopy Background to NIR NIR Thermal Range Spectral Logging • Visible, NIR, SWIR Wavelengths (350-2500nm) • Spectral resolution 1nm • Measurement window 4-24 mm • Limited/no sample contact • No sample prep needed – (lab samples can be crushed) • Measurement time 0.05 secs Spectral Logging Sensitive to most minerals but especially clays Biggest applications: • Mining – mineral exploration • Heritage Conservation (as non contact) • Pharmaceuticals • Biscuits Typical XRD plot for London Clay Typical Lab Spectra • Sensitive to moisture, mineralogy, clay content, organics, plant health, particulate contaminants......... • Relate to weathering, water movement, vegetation growth Dark Clay Orange Sand 0 2500 nm 0 2500 nm Landslide Debris Particle Size Characterization Upper Group Lower Group Intermediate Group Particle Size Characterization • Possible to predict article composition from 2-3 wavelengths e.g. % clay =130.3-82.754*R(λ 2204 ) +937.388 R(λ 1411 ) Moisture Content Next Steps • Black Venn Study: debris flow mobility – does the mixing of debris flow materials relate to how mobile it is? Debris flow mechanics. • China Bailong Corridor (Zhouqu Debris Flow – Lanzhou Uni): properties of source materials with debris flow mobility. Current Research Projects: Engineering NIR Stratigraphy London Clay (Hampshire Basin) White Cliff Bay - Isle of Wight White Cliff Bay Geological -
The Stratigraphical Framework for the Palaeogene Successions of the London Basin, UK
The stratigraphical framework for the Palaeogene successions of the London Basin, UK Open Report OR/12/004 BRITISH GEOLOGICAL SURVEY OPEN REPORT OR/12/004 The National Grid and other Ordnance Survey data are used The stratigraphical framework for with the permission of the Controller of Her Majesty’s Stationery Office. the Palaeogene successions of the Licence No: 100017897/2012. London Basin, UK Key words Stratigraphy; Palaeogene; southern England; London Basin; Montrose Group; Lambeth Group; Thames Group; D T Aldiss Bracklesham Group. Front cover Borehole core from Borehole 404T, Jubilee Line Extension, showing pedogenically altered clays of the Lower Mottled Clay of the Reading Formation and glauconitic sands of the Upnor Formation. The white bands are calcrete, which form hard bands in this part of the Lambeth Group (Section 3.2.2.2 of this report) BGS image P581688 Bibliographical reference ALDISS, D T. 2012. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. British Geological Survey Open Report, OR/12/004. 94pp. Copyright in materials derived from the British Geological Survey’s work is owned by the Natural Environment Research Council (NERC) and/or the authority that commissioned the work. You may not copy or adapt this publication without first obtaining permission. Contact the BGS Intellectual Property Rights Section, British Geological Survey, Keyworth, e-mail [email protected]. You may quote extracts of a reasonable length without prior permission, provided a full acknowledgement is given of the source of the extract. Maps and diagrams in this book use topography based on Ordnance Survey mapping. © NERC 2012. -
Geology of London, UK
Proceedings of the Geologists’ Association 123 (2012) 22–45 Contents lists available at ScienceDirect Proceedings of the Geologists’ Association jo urnal homepage: www.elsevier.com/locate/pgeola Review paper Geology of London, UK a, b,c d e c Katherine R. Royse *, Mike de Freitas , William G. Burgess , John Cosgrove , Richard C. Ghail , f g h i j k Phil Gibbard , Chris King , Ursula Lawrence , Rory N. Mortimore , Hugh Owen , Jackie Skipper a British Geological Survey, Keyworth, Nottingham NG12 5GG, UK b First Steps Ltd, Unit 17 Hurlingham Studios, London SW6 3PA, UK c Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK d Department of Earth Sciences, University College London, WC1E 6BT, UK e Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK f Cambridge Quaternary, Department of Geography, University of Cambridge, CB2 3EN, UK g 16A Park Road, Bridport, Dorset, UK h Crossrail Ltd. 25 Canada Square, Canary Wharf, London E14 5LQ, UK i University of Brighton & ChalkRock Ltd, 32 Prince Edwards Road, Lewes BN7 1BE, UK j Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK k Geotechnical Consulting Group (GCG), 52A Cromwell Road, London SW7 5BE, UK A R T I C L E I N F O A B S T R A C T Article history: The population of London is around 7 million. The infrastructure to support this makes London one of the Received 25 February 2011 most intensively investigated areas of upper crust. However construction work in London continues to Received in revised form 5 July 2011 reveal the presence of unexpected ground conditions. -
Reconstructing a Palaeolithic Landscape
Royal Holloway, University of London Department of Geography London before London: Reconstructing a Palaeolithic Landscape Caroline Juby Thesis submitted for the degree of Doctor of Philosophy September 2011 Declaration of Authorship This thesis presents the results of original research undertaken by the author. Where the work of others has been consulted it is clearly specified and acknowledged. Signed: Date: Picture, Front Page: Reconstruction by Norman Fahy. From Robinson and Litherland (1996) 2 Abstract: London before London: Reconstructing a Palaeolithic Landscape Central London and its suburbs have produced a spectacular diversity of Palaeolithic artefacts in association with some of the most important palaeoenvironmental information in western Europe for the Pleistocene period. During the 19th and 20th centuries, London’s rapid urban development coincided with the beginnings of Palaeolithic research and a new-found interest in the antiquity of humans and ancient landscapes. Contemporary antiquarians amassed extensive collections of artefacts and fossils as gravel extraction and construction occurred on an unprecedented scale. Nevertheless, in recent times, London has experienced a significant decline in research into its Palaeolithic heritage, at the expense of other parts of the Thames valley and southern England. However, thanks to the extraordinarily rich repository of antiquarian artefacts and faunal remains, new interpretations are now possible and these collections form the basis for the work presented here. Through the re-evaluation of over 16,400 artefacts and 4700 faunal remains from multiple localities (ranging from individual findspots to ‘super sites’), the thesis explores the timing and nature of Palaeolithic occupation of London and its suburbs from the very earliest evidence in the Middle Pleistocene to the end of the last glaciation through a series of discrete time slices. -
Isle of Wight Geodiversity Action Plan
Isle of Wight Local Geodiversity Action Plan (LGAP) Isle of Wight Local Geodiversity Action Plan (IWLGAP) Geodiversity (geological diversity) is the variety of earth materials, forms and processes that constitute either the whole Earth or a specific region of it. The sequence of early Cretaceous Wealden rocks at Barnes High. Sedimentation by rivers, lakes and river deltas can all be seen at this one site. February 2010 (First Draft [2005] produced for: English Nature contract no. EIT34-04-024) 1st online issue February 2010 Page 1 of 87 Isle of Wight Local Geodiversity Action Plan (LGAP) ‘The primary function of the Isle of Wight Local Geodiversity Action Plan is to formulate a strategy to promote the Isle of Wight through the conservation and sustainable development of its Earth Heritage.’ Geodiversity (geological diversity) is the variety of earth materials, forms and processes that constitute either the whole Earth or a specific region of it. Relevant materials include minerals, rocks, sediments, fossils, and soils. Forms may comprise of folds, faults, landforms and other expressions of morphology or relations between units of earth material. Any natural process that continues to act upon, maintain or modify either material or form (for example tectonics, sediment transport, pedogenesis) represents another aspect of geodiversity. However geodiversity is not normally defined to include the likes of landscaping, concrete or other significant human influence. Gray, M. 2004. Geodiversity: Valuing and Conserving Abiotic Nature. John Wiley & Sons Ltd, Chichester. 1st online issue February 2010 Page 2 of 87 Isle of Wight Local Geodiversity Action Plan (LGAP) EXECUTIVE SUMMARY Much of what we do is heavily influenced by the underlying geology; from where we build, grow crops, collect water and where we carry out our recreational activities. -
TLS Executive Summary 2017
Thames Landscape Strategy Weybridge – Hampton – Kew Conserving Arcadia Executive Summary 2017 Patrons: HRH The Duke of Gloucester KG GCVO Sir David Attenborough OM CH CVO Kim Wilkie Summary The Thames Landscape Strategy is a not- for-profit partnership for the river corridor between Weybridge, Hampton and Kew. Our aim is to understand, promote and conserve this special stretch of the river and to enhance its character – both natural and manmade. Launched in 1994, the TLS is a 100-year blueprint for the Thames, whose vision is set out in the Thames Landscape Strategy report (2012 revision) that provides strategic guidance for the Thames corridor. To achieve our aims, the Strategy brings together a partnership of statutory and non- statutory organisations, local groups and individuals to inform policy and to provide a link between the authorities, the community and the vision. The TLS employs two full time members of staff who provide a catalyst to implement project work on the ground. Since 2000, more than £21M has been raised to enhance the Thames corridor on a range of schemes including landscape restoration, biodiversity works, recreational improvements, habitat creation, catchment management and flood risk enhancements. The TLS partnership has an active volunteer programme having managed 305,000 volunteer hours over 15 years. The TLS Towpath Management Plan is updated annually setting out the day-to- day actions needed to manage the diverse and much cherished riverbanks of the Arcadian Thames. The Thames Landscape Strategy partnership works with the Father Thames Trust and Action Arcadia CIC and .is the chair of the All London Green Grid Area Nine partnership for the Arcadian Thames ‘The Thames Landscape Strategy is as much about the day-to-day link between the landscape, the community and the authorities as about the long term vision’ Kim Wilkie The Arcadian Thames Between Weybridge, Hampton and Kew the River Thames meanders through a unique landscape of parks, royal palaces and working communities known as the Arcadian Thames (meaning ‘rural paradise’). -
NCA Profile:114 Thames Basin Lowlands
National Character 114 Thames Basin Lowlands Area profile: Supporting documents www.naturalengland.org.uk 1 National Character 114 Thames Basin Lowlands Area profile: Supporting documents Introduction National Character Areas map As part of Natural England’s responsibilities as set out in the Natural Environment White Paper1, Biodiversity 20202 and the European Landscape Convention3, we are revising profiles for England’s 159 National Character Areas (NCAs). These are areas that share similar landscape characteristics, and which follow natural lines in the landscape rather than administrative boundaries, making them a good decision-making framework for the natural environment. NCA profiles are guidance documents which can help communities to inform their decision-making about the places that they live in and care for. The information they contain will support the planning of conservation initiatives at a landscape scale, inform the delivery of Nature Improvement Areas and encourage broader partnership working through Local Nature Partnerships. The profiles will also help to inform choices about how land is managed and can change. Each profile includes a description of the natural and cultural features that shape our landscapes, how the landscape has changed over time, the current key drivers for ongoing change, and a broad analysis of each area’s characteristics and ecosystem services. Statements of Environmental Opportunity (SEOs) are suggested, which draw on this integrated information. The SEOs offer guidance on the critical issues, which could help to achieve sustainable growth and a more secure environmental future. 1 The Natural Choice: Securing the Value of Nature, Defra NCA profiles are working documents which draw on current evidence and (2011; URL: www.official-documents.gov.uk/document/cm80/8082/8082.pdf) 2 knowledge. -
The Strategic Stone Study by Joan Blows
STRATEGIC STONE STUDY A Building Stone Atlas of KENT Published October 2011 Derived from BGS digital geological mapping at 1:625,000 scale, British Geological Survey © Kent Bedrock Geology NERC. All rights reserved Click on this link to visit Kent’s geology and its contribution to known building stones, stone structures and building stone quarries (Opens in new window http://maps.bgs.ac.uk/buildingstone?County=Kent ) Kent Strategic Stone Study 1 Introduction In the 11C, the Norman invasion introduced new building techniques and ideas. This was The indigenous Kent building stones are all of followed by the construction of many large SEDIMENTARY origin, and were predominantly ecclesiastical buildings and castles in Kent. At this quarried from the Cretaceous rocks of the time, the lack of sufficient quantities of durable county. They comprise mainly sandstones and local FREESTONE suitable for DRESSING and sandy limestones. FLINT, CHALK, TUFA and carving within the county, and the ready access CONGLOMERATE have also been used in the past by sea to the more familiar limestones from as vernacular building stone. their homeland, such as Caen Stone, saw the importation of stones by the Norman builders The subtropical or tropical environments in into the south east of England for many new which these sediments were deposited ranged large building schemes e.g. the use of Caen from non-marine to marginal to open marine Stone at Canterbury Cathedral. conditions. The non-marine sediments were laid down under fluvial, deltaic and estuarine The dissolution of the monasteries in the 16C conditions, giving rise to substantial lateral made substantial quantities of Caen Stone and vertical variability in the resultant clastic available for re-use in subsequent building sequences (SANDSTONE, SILTSTONE and construction, often alongside other vernacular MUDSTONE). -
Bedrock Geology 32 Quartenary Deposits 51 Fossils and Palaeontology 61
GREEN INFRASTRUCTURE AND OPEN ENVIRONMENTS: London’s FOUNDATIONS: PROTECTING THE GEODIVERSITY OF THE CAPITAL SUPPLEMENTARY PLANNING GUIDANCE MARCH 2012 LONDON PLAN, 2011 IMPLEMENTATION FRAMEWORK ACKNOWLEDGEMENTS: The work to prepare and produce London’s Foundations, published in 2009 was made possible by funding from Natural England via the Defra Aggregates Levy Sustainability fund (ALSF), The Greater London Authority (GLA), British Geological Survey (BGS) and Natural England London Region. In-kind project support was provided by London Borough of Lambeth, Natural England, Hanson UK, British Geological Survey, Harrow and Hillingdon Geological Society, South London RIGS Group and London Biodiversity Partnership. BGS prepared the draft report in 2008 on behalf of the London Geodiversity Partnership, led by the GLA. BGS is a component body of the Natural Environment Research Council. BGS Report authors: H F Barron, J Brayson, D T Aldiss, M A Woods and A M Harrison BGS Editor: D J D Lawrence The 2012 update was prepared by Jane Carlsen and Peter Heath of the Greater London Authority with the assistance of the London Geodiversity Partnership. Mapping updates provided by Julie MacDonald of Greenspace Information for Greater London. Document production by Alex Green (GLA). The Mayor would like to acknowledge the work and extend thanks to the London Geodiversity Partnership who contributed to the revision of London’s Foundations SPG and those who responded to the consultation. Maps and diagrams have been prepared by the authors, except where stated. This report includes mapping data licensed from Ordnance Survey with permission of the Controller of Her Majesty’s Stationery Office © Crown Copyright and/or database right 2008. -
Anomalous Buried Hollows in London: Development of a Hazard Susceptibility Mapv
research-articleResearch Article10.1144/qjegh2014-037Anomalous buried hollows in London: development of a hazard susceptibility mapV. J. Banks, S. H. Bricker, K. R. Royse, P. E. F. CollinsXXX10.1144/qjegh2014-037V. J. Banks et al.Anomalous buried hollows in London 20152014-037 Research article Quarterly Journal of Engineering Geology and Hydrogeology Published online February 23, 2015 doi:10.1144/qjegh2014-037 | Vol. 48 | 2015 | pp. 55 –70 Anomalous buried hollows in London: development of a hazard susceptibility map V. J. Banks1*, S. H. Bricker1, K. R. Royse1 & P. E. F. Collins2 1 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK 2 Brunel University, Kingston Lane, Uxbridge UB8 3PH, UK * Correspondence: [email protected] Abstract: Engineering works carried out in central London over many decades have revealed a number of buried hollows that exhibit curious characteristics. Some extend deep into the bedrock geology and are in-filled with disturbed superficial deposits and reworked bedrock. Others are contained within the superficial deposits. They can be up to 500 m wide and more than 60 m in depth. As the infill material often has different behavioural characteristics from the surrounding deposits failure to identify them during an initial site investigation can prove costly. This paper considers their common characteristics and describes the method used to develop a buried hollow hazard susceptibility map. This map provides planners with a broader awareness of the potential location of difficult ground conditions associated with them, thereby reducing the potential for unforeseen ground conditions through effective site investigation design. The paper continues with a discussion of some of the likely processes associated with their formation, which are attributed to cryogenic processes, and concludes with poten- tial future research directions.