A statement issued yesterday by the government and Mayan archaeologist Francisco Estrada-Belli, who with his team found the structure in the northern Province of Peten, home to other big classic ruin sites.
Estrada-Belli is a professor at Tulane University's Anthropology Department.
The frieze is 8 meters long and 2 meters wide and was found at a Mayan pyramid that dates to AD 600. It includes three main characters wearing rich ornaments of quetzal feathers and jade sitting on monsters heads.