The world's oldest "calendar" is believed to have been discovered in a Scottish field.
Twelve pits excavated in Aberdeenshire appear to mimic the phases of the moon over the course of a year, according to new analysis by experts.
Until now the first formal time-measuring devices were thought to have been created in Mesopotamia - now Iraq, north-east Syria and parts of Turkey - about 5,000 years ago.
However, the pit alignment near Crathes Castle predates those discoveries by thousands of years.
The monument, which was excavated between 2004-06 and recently analysed by a team led by the University of Birmingham, is said to have been created by hunter-gatherer societies nearly 10,000 years ago.
Researchers said the monument also aligns on the Midwinter sunrise, which they said would provide an annual "astronomic correction" to maintain the link between the passage of time indicated by the moon, the solar year and the seasons.
The pit site was first discovered when unusual crop markings were noticed during an aerial survey by the Royal Commission on the Ancient and Historical Monuments of Scotland.
It lies on the National Trust for Scotland's Crathes Castle estate and was excavated by the trust and Murray Archaeological Services.
The research was published in the journal Internet Archaeology.