A powerful woman stands at the center of the carving, flanked by two smaller decapitated women. A stream of liquid flows from the headless women toward the woman in the center... The women on each side are thought to represent priestesses, and the liquid represents the life force, while the woman at the center represents Mother Earth; so the priestesses seem to be nurturing the Earth with their life force. The truth is, however, nobody knows for sure what these stones mean."...although it appears to mean that one woman has just cut off the heads of two other women, either a some sort of human sacrifice, or as a consequence of some kind of cat fight."
One thing is fairly certain -- because of the recurrence of the number 13, the monolith seems to be a lunar calendar of some sort. That's why it set the archaeological world abuzz with discussion when it was unveiled last November. It is believed to have been created around 600 B.C. -- 2,000 years before what was previously the oldest discovered calendar in the Americas, the Aztec Calendar, which dates to A.D. 1400.Huh? The Mayan calendar is now very well understood, and antedates the Aztec calendar.
And the Mayan Long Count calendar was originally developed by the Olmecs -- the true Mesoamerican foundational culture. They date back to around 1800 B.C. although it's not known just when they developed the Long Count. The Aztecs were latecomers.