Revisiting the provenance of the Stonehenge bluestones: Refining the provenance of the Group 2 non-spotted dolerites using rare earth element geochemistry

•Rare earth element geochemistry applied to provenancing the Stonehenge bluestones.•New data suggests Groups 1 and 3 spotted dolerites may be from a single source.•The source of one Stonehenge non-spotted dolerite is identified as Cerrigmarchogion.•The source of three other non-spotted dolerites remains uncertain.•The REE data are analysed using shape factors derived from polynomial curve fitting.