The circular stone platform and a monolithic sculpture found at the Campo Viejo site have been dated to the Early Classic period, between A.D. 200 and 600.
Sources
- Unusual Platform and Monolith Found in Eastern Mexico (archaeology.org)
- This Ancient Monolith That Archaeologists Unearthed in Mexico May ... (smithsonianmag.com)
- https://www.sciencealert.com/ancient-ruins-found-in-mexico-have-never-before-seen-features (sciencealert.com)
- https://www.france24.com/en/americas/20260620-mexican-archaeologists-unearth-ancient-ruins-with-unique-mayan-features (france24.com)
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