. . "Mudstone that contains no detectable silt, inferred to consist virtually entirely of clay-size particles."@en . "claystone"@en . . . . . . . . . . "Mudstone that contains no detectable silt, inferred to consist virtually entirely of clay-size particles."@en . "http://inspire.ec.europa.eu/codelist/LithologyValue/claystone"^^ . "2015-08-18 18:02 PM CEST"^^ . . . "claystone"@en .