A stone carving found in Oaxaca, Mexico, contains a 260-day divinatory calendar which has been carbon dated to about:

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The 260-day divinatory calendar, known as the Tzolk'in in Mayan culture, is a significant part of Mesoamerican cultures, including the Zapotecs of Oaxaca. The dating of artifacts related to this calendar, such as stone carvings, to around 600 BCE is consistent with the archaeological understanding of the development of complex calendar systems in Mesoamerica.

A Stone Carving Found in Oaxaca, Mexico, Contains a 260-Day