A cylcon is a cylindrical stone tapering at one end and marked with incisions.
Archaeologists have sometimes assigned cylcons an original ritual, magical, or religious function that over time was displaced by a more utilitarian one, that of a pestle for use in food production.
[2] It is impossible to date most cylcons, but the very heavy weathering of most attests to their great age.
The earliest yet found in a dateable archaeological context is about 20,000 years old.
They belong, with the earliest Aboriginal rock art, to the Early Stone Age.