🌐EnglishEnglishDeutschSvenska中文日本語EntityQ1358009· pop 8· linked from 74 articlesalum shalesedimentary rockConnectionsgeological formationEntityFinlandCountryCategoriesCambrian NorwayCambrian southern paleotemperate depositsCambrian System of EuropeGeologic formations of DenmarkGeologic formations of NorwayGeologic formations of SwedenLagerstättenOil shale geologyOrdovician NorwayOrdovician southern paleotemperate depositsOrdovician SwedenOrdovician System of Europe