. "Highly fossiliferous silty mudstones, siltstones and fine-grained sandstones."@en . . "30-55m"@en . "Grain Heads Siltstone Member"@en . "Conformable: highest laminated sandy siltstones and fine-grained sandstones with abundant bioclasts on bedding planes, below Lamb Rig Siltstone Member."@en . "Lower part of fossiliferous mudstones and siltstones [Obsolete: use GHD]"@en . "Units A to C, Wether Law Linn Formation [Obsolete: use GHD]"@en . . "Lower Member, Wether Law Linn Formation [Obsolete: use GHD]"@en . "GHD"@en . . "Beds D to E [Obsolete: use GHD]"@en . . "Siltstone and silty mudstone with subsidiary sandstone and trace clay. Stratified bedrock. Occurs onshore. Deposited during the Telychian Age (Silurian Period) (438.6-432.9 Ma BP)."@en . . . "Beds at D to E [Obsolete: use GHD]"@en . "Conformable: green-grey bioturbated mudstones immediately overlying medium- to coarse-grained sandstones of the Cock Rig Formation."@en . "Grain Heads Siltstone Member"@en . "Lower part of Bed C [Obsolete: use GHD]"@en . "438.6"^^ . . "432.9"^^ . . . . . . . "stable"@en .