Llandoverian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Silurian
 ....Lower Silurian
 .....Llandoverian
NTInterlake Formation
UFValentian
RTLlandovery Wales
SNValentian. Europe. Above Ashgillian (Ordovician), below Wenlockian.