Some of the earliest archaeological evidence of the swastika in the Indian subcontinent can be dated to 3,000 BCE. Investigators have also found seals with mature and geometrically ordered swastikas that date to before the Indus Valley Civilisation (3300-1300 BCE). Their efforts have traced references to swastikas in the Vedas at about that time. The investigators put forth the theory that the swastika moved westward from India to Finland, Scandinavia, the Scottish Highlands and other parts of Europe. In England, neolithic or Bronze Age stone carvings of the symbol have been found on Ilkley Moor, such as the Swastika Stone.