... where it containspartings and laminations of silt and occasionally fine sand which can develop into more prominent sandunits of about 0.5 m thickness. Here, the upper contact is marked by an organic horizon. C This is a distinctive variously coloured clay, often very mottled with a gradational contact...

... in old docks, e.g. at PoplarDock, East India Dock and East India Dock Basin. Around the docks are soft to firm often organic clays with brick fragments, representing dredged or excavated alluvium placed to make up ground levels. Slightly strongerbut very variable materials include the essentially...