EntityQ6497665· pop 7· linked from 98 articlesLau eventSign in to savemass extinction event in the Ludfordian age of the Silurian period, ca. 424 MaConnectionsInternational Standard Serial NumberEntityextinction eventEntityPermian-Triassic mass extinctionEntityOrdovician–Silurian extinction eventEntitySwedenCountryWalesEntityyearEntityglacierEntityisotopeEntitydigital object identifierEntityCretaceousEntityJurassicEntityGotlandEntityTriassicEntityPaleozoicEntityhumidityEntityCambrianEntityDevonianEntityPermianEntitySilurianEntityCategoriesExtinction eventsIsotope excursionsSilurian