"422.7"^^ . "Ludfordian Age"@en . . . "stable"@en . "425.0"^^ . . "Ludfordian Age"@en . "Ludfordian Age is a division of geological time within the Silurian Period. It is the second of the two ages within the Ludlow Epoch. It is preceded by the Gorstian Age and succeeded by the Pridoli Epoch (Geologic Time Scale 2020, figs. 2.1, 21.1; https://timescalefoundation.org/)."@en . "SD"@en . .