"Not seen in area of survey."@en . "Mudstone and siltstone. Stratified bedrock. Occurs onshore. Deposited during the Ludlow Epoch (Silurian Period) (426.7-422.7 Ma BP)."@en . "c. 125m. Lateral variations 0-400m."@en . "Lower Bishopsmoat Beds"@en . "426.7"^^ . . . "Grey interbedded mudstones and siltstones; thin siltstones show parallel lamination, thicker beds are calcareous and commonly show intense convolute lamination."@en . "422.7"^^ . . . . "stable"@en . "Lower Bishopsmoat Beds"@en . "BIML"@en . . . "Upward change in lithology from grey thickly bedded (blotchy) mudstone to grey interbedded siltstones and mudstones; thicker siltstones are calcareous and commonly show intense convolute lamination."@en .