Most experts had cited only one surviving reference to the date in Mayan glyphs, a stone tablet from the Tortuguero site in the Gulf coast state of Tabasco.
But the National Institute of Anthropology and History said in a statement that there is in fact another apparent reference to the date at the nearby Comalcalco ruin. The inscription is on the carved or molded face of a brick. Comalcalco is unusual among Mayan temples in that it was constructed of bricks.
Arturo Mendez, a spokesman for the institute, said the fragment of inscription had been discovered years ago and has been subject to thorough study. It is not on display and is being kept in storage at the institute.
The "Comalcalco Brick," as the second fragment is known, has been discussed by experts in some online forums. Many still doubt that it is a definite reference to Dec. 21, 2012 or Dec. 23, 2012, the dates cited by proponents of the theory as the possible end of the world.
"Some have proposed it as another reference to 2012, but I remain rather unconvinced," David Stuart, a specialist in Mayan epigraphy at the University of Texas at Austin, said in a message to The Associated Press.
Stuart said the date inscribed on the brick "'is a Calendar Round,' a combination of a day and month position that will repeat every 52 years."
The brick date does coincide with the end of the 13th Baktun; Baktuns were roughly 394-year periods and 13 was a significant, sacred number for the Mayas. The Mayan Long Count calendar begins in 3114 B.C., and the 13th Baktun ends around Dec. 21, 2012.
But the date on the brick could also correspond to similar dates in the past, Stuart said.
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