. "Bedded tuff and lapilli-tuff (air-fall) with some pyroclastic breccia, intercalated andesite and basaltic andesite lava."@en . "Duddon Hall Tuff Formation"@en . "458.2"^^ . "At base of overlying formations including Ulpha Formation (andesite), Holehouse Gill Formation (mudstone and sandstone) and Wallowbarrow Formation (andesitic lapilli-tuff)."@en . "DH"@en . "Lower Tilberthwaite Tuffs [Obsolete: use DH]"@en . "stable"@en . "449.75"^^ . "Andesitic lapilli-tuff and andesitic tuff with subsidiary andesite, basalt and pyroclastic-breccia. Stratified bedrock. Occurs onshore. Deposited during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en . . . . . "Base of bedded tuff and lapilli-tuff (air-fall), unconformably overlying Airys Bridge Tuff Formation, (rhyodacitic tuff) and Waberthwaite Tuff Formation (dacitic tuff)."@en . "Duddon Hall Tuff Formation"@en . . "200 to 450m"@en . "Duddon Bridge Tuffs [Obsolete: use DH, DBT]"@en . . . . . . "Duddon Hall Tuffs [Obsolete: use DH]"@en .