. "449.75"^^ . . . "A medium to coarse-grained and weakly cleaved, lithic sandstone arenite, which contains chloritised grains, possibly after serpentine, and chromite grains."@en . . "Highland Border Sandstones [Obsolete: use BMSA]"@en . "Burn Of Mar Sandstone Formation"@en . "Highland Border Grits [Obsolete: use BMSA]"@en . . "Not seen, as either faulted against younger or older rocks, or juxtaposed against sheared and silicified serpentinite."@en . "Loch Lomond Clastics [Obsolete: use BMSA]"@en . . "Burn Of Mar Sandstone Formation"@en . "BMSA"@en . "stable"@en . "Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Abereiddian Stage - to - Caradoc Series (Ordovician Period) (468-449.75 Ma BP)."@en . "468.0"^^ . . "Not seen, as either faulted or unconformably overlain by Upper Devonian, Upper Old Red Sandstone Facies strata."@en . . . "At least 200 m thick."@en .