Dating iron artefacts
KHOTAN in the western Central Asia was already a supplier of Jade, of the Middle Ages until today.
Old Russian sources go back however much further, then to process Jade/Nephrit slowly with grinding powders, was not only known in the old China, but were practised much earlier in the range of the Baikals and the Ural area.
Originating in the later Bronze Age (1000 BC - 800 BC), the hill forts of the early Iron Age are found over a wide area of the British Isles: in Scotland (Finavon Fort in Angus), Wales (The Brieddin and Moel y Gaer in Powys) and England (Grimthorpe in Yorkshire, Ivinghoe Beacon in Buckinghamshire and Bathampton Down in Somerset).
Many seem to have been used infrequently and may have been seasonal meeting places and food stores rather than permanently inhabited settlements.
In principle, the Bi-Disk is a carved, mostly a round Jade Disk, with one middle hole of most various size.
It will be used as status symbol, for ritual and/or symbolic purposes.
They could be used to carry or pull timbers on sledges, for example, over long distances.
Later pieces are then decorated extremely with ornaments, waves, characters and various mythical animals.
Although not proved, symbolize these disks the sun and/or the sky and be signs of eternal life (circle without beginning and without end).
One thought the Jade would bring rain, kept demons and poisonous animals away, would bring honour, success, and at apart set reeds got the victory and quenched the thirst.
Furthermore It should guarantee long life, if it was cut as a stork or a bat.