The Tumulus X of Gordion dates to the destruction level of Gordion destruction caused by Kimmerians, i.e. the early 7th century BC.
See:
- Gabriel Pizzorno, Gareth Darbyshire: Mapping Gordion in: C. Brian Rose eds., The Archaeology of Phrygian Gordion, Royal City of Midas: Gordion Special Studies 7 (2013). pp. 23-38
- http://www.tayproject.org/TAYages.fm$Retrieve?CagNo=9497&html=ages_detail_e.html&layout=web
- Richard Liebhart, Gareth Darbyshire, Evin Erder, Ben Marsh, A Fresh Look at the Tumuli of Gordio, in: Tumulus as Sema. Vol XXVII, 2016