. "Greenmoor Rock"@en . "stable"@en . "318.0"^^ . "GM"@en . "Greenmoor Rock"@en . . . . "The Greenmoor Rock is a fine-grained thinly bedded, ripple cross-laminated sandstone. Within this district it usually occurs as groups of thin sandstone and siltstone beds interbedded with greenish grey mudstone."@en . . . . "Sandstone with subsidiary siltstone and trace mudstone. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . "319.0"^^ . "Between 30 and c.45m"@en . .