Geological unit River terrace deposits
Marine and coastal zone deposits
Kesgrave formation
Description Sand and gravel
Mud deposits formed in tidal flats, channels and saltmarshes
Glaciofluvial sands and gravels
General location
Kirton Creek, Martlesham Creek, River Gipping
River Deben
Extensive areas between Falkenham and Playford, and further presence on rest of route
Alluvium Boulder clay
Bedrock geology Red Crag formation
Sandy, silty clay
Diamicton, stony, sandy clay rich in chalk and flint pebbles
Coarse-grained, poorly sorted, cross-bedded, abundantly shelly sands. Typically yellow or reddish brown. Basal bed of rounded flint pebbles
Thames Group (including London Clay)
Predominantly a silty clay/ mudstone, with some sandy silts and sandy clayey silts of marine origin. The London Clay is a fine, sandy, silty clay
Chalk Group
Lambeth Group and Thanet Sand Formation
Chalk, with or without flint and discrete limestone and fossil-rich beds
There are various units within this group, which mainly comprise sand with flint pebbles, clay (often with interposed sand beds) and interlayered beds of sands, silts and clays
3.2.4 Quarrying and mineral extraction
Evidence has been sought to identify any mining and quarrying operations, past and present, which have taken place in the vicinity of the onshore electrical transmission works. The sources of information referenced in this element of the desk study include:
• Envirocheck report; • Suffolk Minerals and Waste; and • Geological maps.
Superficial glacial sand and gravel deposits are known to have been subject to
extraction in this area of Suffolk. The London Clay has also been extracted in some areas through the excavation of brick pits. Disused quarries, sand pits and brick pits may have been used as landfill sites (see Section 3.2.5).
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
11
Martlesham Creek, River Gipping
Between Playford and converter station
Outcrops irregularly along much of eastern half of Preferred Onshore Cable Corridor
Underlies superficial deposits from landfall to Akenham
Around River Gipping
Western end of route and beneath northern part of Converter Station Refined Area of Search
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