"Up to 15m"@en . "Dark grey to greyish brown, locally reddish brown, very stiff, stony sandy silty clay diamicton with sparse fragments of shell. It contains clasts mostly of Carboniferous lthologies in southern Northumberland, with far-travelled rocks from the Southern Uplands and, south of Blyth, from the Lake District too; local Permian lithologies predominate south of the Tyne. Generally becomes more clayey and plastic upwards. Includes local lenses of sand and gravel."@en . . . "Blackhall Member"@en . . "Blackhall Till Formation"@en . "Durham Lower Till [Obsolete: use BHTI]"@en . "BHTI"@en . . "0.0118"^^ . "0.116"^^ . . "Blackhall Till Formation"@en . . . "Diamicton with subsidiary gravel and trace sand. Stratified superficial deposits. Occurs onshore. Formed during the Devensian Stage (Quaternary Period) (.116-.0118 Ma BP)."@en . . . "Either rests directly on bedrock or as a sharp, subhorizontal, planar to gently undulating contact with limestone-rich gravel of the Limekiln Gill Gravel Formation."@en . . "Generally a sharp, uneven, erosional contact with overlying red fine-grained sand of the Peterlee Sand Formation along the Durham coast."@en . "stable"@en .