Borrowdale Volcanic Series  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Borrowdale Volcanic Series
RTEngland
 Llandeilian
 Llanvirnian
SNLlanvirnian and ? Llandeilian. Underlain by Skiddaw Slates and overlain by the Coniston Limestone Group. Lake District in NW England.