Veracruz and Chiapas
La Venta suffered the fate of San Lorenzo, having been destroyed by violence around 400 bce. Olmec civilization subsequently disappeared or was transformed into one or more of the cultures of the southeastern lowlands.
One centre that retained a strong Olmec tradition, however, was Tres Zapotes, near the Tuxtla Mountains in the old Olmec “heartland.” Its most famous monument, the fragmentary Stela C, is clearly epi-Olmec on the basis of a jaguar-monster mask carved in relief on its obverse. On the reverse is a column of numerals in the bar-and-dot system, which was read by its discoverer, Matthew W. Stirling, as a date in the Maya calendar corresponding to 31 bce; this is more than a century earlier than any known dated inscription from the Maya area itself. Thus, it is highly probable that this calendrical system, formerly thought to be a Maya invention, was developed in the Late Formative by epi-Olmec peoples living outside the Maya area proper.