A name for the period after the Olmec
The term “Epi-Olmec” is used by archaeologists for the cultures of the southern Gulf coast and the Isthmus of Tehuantepec after the great Olmec centres of San Lorenzo and La Venta had declined, roughly from the last few centuries BCE into the first few centuries CE. The word means “after” or “on top of” the Olmec, and it is a modern label. Scholars also use “Isthmian” for the same broad region and for its writing system. Neither term is the name a person living there would have used.
The period is sometimes overlooked, and so the word “forgotten” in the title has some truth. But it is not a lost civilization. It left stone monuments with portraits, texts and calendar dates, and these have been studied since the early twentieth century. The main uncertainty is how much of the writing can be read.
Tres Zapotes and the Gulf coast
Tres Zapotes, in southern Veracruz, is important because it spans both periods. It was occupied during the Olmec era, and its colossal heads belong to that earlier phase. The site continued to be used after La Venta was abandoned, and its later monuments show a different style. They reflect a gradual change in carving and in how rulers were presented, not a clean break.
The best-known monument is Stela C, found in the late 1930s by the archaeologist Matthew Stirling. It carries a date in the Long Count calendar, a system that counts days from a fixed starting point using a place-value notation of bars and dots. The part of the stela with the date was incomplete when it was found, and Stirling reconstructed the missing number. A later find of another fragment is generally taken to have supported the reading. The date corresponds to 32 BCE in the usual conversion, which made it one of the earliest Long Count dates then known.
Dates from the Isthmus
Other monuments in the wider Isthmian region carry similar dates:
- Chiapa de Corzo, in Chiapas, has a stela with a Long Count date that converts to about 36 BCE, and is sometimes cited as slightly earlier than Tres Zapotes Stela C.
- The Tuxtla Statuette, a small carved stone figure found in 1902, has a text with a date corresponding to 162 CE.
- La Mojarra Stela 1, found in the 1980s near the Acula River in Veracruz, carries two dates that convert to about 143 CE and 156 CE.
La Mojarra Stela 1 is a large carved slab that shows a richly dressed figure, usually seen as a ruler, with blocks of text running alongside. It is among the longest known inscriptions in the Isthmian script, with several hundred signs. Together, these inscriptions show that people of the Gulf coast and nearby regions were recording dates, names and events in writing before the Classic Maya cities had many surviving inscriptions.
Reading the Isthmian script
The Isthmian script, also called the Epi-Olmec or La Mojarra script, is only partly understood. In the 1990s, the scholars John Justeson and Terrence Kaufman published a proposed decipherment, arguing that the language was an early form of the Mixe-Zoquean family and reading the La Mojarra text as an account of a ruler’s accession and deeds. Their work depended partly on a comparison with known Mixe-Zoquean words.
Other scholars have questioned the method and the results. Decipherment is hard when the texts are few, because there is no bilingual text like the Rosetta Stone to provide a check, and the readings cannot be confirmed independently. The careful position is that the date notation is well understood, that some signs and phrases may be read, and that the full text is still under debate. A reader should be wary of any source that presents the whole inscription as a settled translation.
A link between Olmec and Maya?
The Isthmian region matters for a wider reason. The Long Count calendar was used in later Maya inscriptions, and the Maya calendar system became one of the best-documented ideas in Mesoamerica. But the earliest known dates are not found in the Maya heartland. Instead they appear at places such as Chiapa de Corzo, Tres Zapotes and sites on the Pacific side of Guatemala. For example, the earliest securely dated Long Count inscriptions in the Maya lowlands, such as one at Tikal, correspond to about 292 CE, several centuries after the earliest Isthmian dates.
Many scholars therefore propose that the Long Count, and possibly some early habits of writing, developed in the Isthmian area and then spread to the Maya. Others treat the picture as less settled, since monuments can be lost or buried, and the Maya may have developed related ideas independently or alongside. The Calendar Round cycle, which combined a 260-day count with a 365-day count, was already part of a shared Mesoamerican inheritance. The Long Count added a way of fixing events in an absolute sequence.
It is also fair to say that writing in Maya cities was far more extensive. The story of Maya glyph decipherment shows how a script that was once opaque can be recovered when enough material survives, which is the hope, so far unrealised, for the Isthmian texts.
Why it matters
Epi-Olmec culture shows that Mesoamerican history did not move in a straight line from Olmec to Maya. In between lay several centuries of regional kingdoms and towns with their own art and writing. Their legacy was passed on through trade, shared ideas and the movement of people, though the details are uncertain. Descendants of people from the region still live in southern Mexico today. Further excavation, careful dating, and any new finds of inscribed monuments would help to answer how far the Isthmian script influenced what came after.