Researchers determined that the five cut stones, which was found in the Central Anatolian province of Kayseri in 2013, were used in agricultural activities based on the positions of the moon and stars.
Bilgin Yazlık, an instructor at Nevşehir Hacı Bektaş Veli University who has spent years researching stones protected by the Kayseri Museum Directorate, revealed the biodynamic agriculture calendar of the Roman era, based on similar calendars used during the same period and the figures on the stones.
Yazlık said that the stones were dated using fourth-century coins discovered during excavations started in the region in 2005.
Yazlık explained that the stones have pictures on them, saying: "I saw that there are spots on them that mimic moon phases and constellations, placed in a certain methodical fashion."