What the heads are
The colossal heads are the best-known works of the Olmec. They are large carvings of human heads, each cut from a single block of volcanic basalt, with broad faces, thick lips and wide noses, and each wearing a close-fitting cap or helmet. Seventeen are commonly counted: ten at San Lorenzo, four at La Venta, two at Tres Zapotes and one at Rancho La Cobata. They are broadly dated to between about 1200 and 400 BCE, with the San Lorenzo heads usually placed in the earlier part of that range. The heights vary, from about one and a half metres to more than three, and the weights run from several tonnes to well over twenty for the largest.
They were known to local people long before scholars arrived. The first to be reported in print was found near Tres Zapotes in the 1860s, and the American archaeologist Matthew Stirling led expeditions in the 1930s and 1940s that found many more. Those excavations shaped the modern picture of the Olmec as an early civilization of the Gulf coast, and they remain central to the wider story of Olmec civilization.
Stone from far away
The heartland is a low, wet plain, and it has no basalt of its own. The stone came from the Tuxtla Mountains, a volcanic range to the north-west. Analysis of the rock has matched many monuments to sources there, including a volcano called Cerro Cintepec. The distance from the quarries to the sites is often given as roughly 60 to 100 kilometres, and it varies by site and route.
That distance is the main puzzle. Large boulders were chosen at or near the source, rough shaping may have started there, and then the stone had to be taken to the building sites. Scholars generally propose a combination of methods:
- Dragging on wooden rollers or sledges over the dry ground.
- Floating on large rafts along rivers and coastal waters, a plausible route since the plain is crossed by waterways.
- Using human labour in large teams, with ropes made from plant fibre.
No direct record shows which was used, and several may have been combined. Comparisons are sometimes drawn with other cultures that moved huge stones, such as the debated moai transport methods of Easter Island, but these are different places and traditions, and the comparison can only suggest what might have worked.
The carving was done with tools made of harder stone, since the Olmec did not have metal tools of this kind. Pounding and abrasion with sand and water would have worked slowly, which suggests a workforce of skilled sculptors who were supported by their community.
Portraits of rulers?
Most specialists believe that the heads portray individual rulers. Each face has distinct features, and no two are identical. The headgear also varies, with different patterns, straps and ornaments, and some earflares are shown. These details may mark a person’s identity or office, much as later Mesoamerican rulers were shown with specific regalia.
Several pieces of evidence support the idea that the heads served a political purpose:
- They were placed in prominent locations, often in lines or groups at the edges of the ceremonial centres.
- Some are carved from stones that had earlier been used as thrones or altars, and the faces were cut into the old block. This hints at a link between rulers and the thrones they sat on, and suggests that monuments could be recycled.
- The labour required would have been controlled by someone with authority over many people, which supports the view that these societies had a ruling elite.
It is important to be careful here. No inscription names a ruler on the heads, and the identification with rulers is an inference from the style and the setting. Other readings have been proposed, including links to ballplayers, since the helmets resemble protective headgear, though most scholars find the ruler interpretation more convincing.
Questions about origins
A claim sometimes made is that the faces show an African origin for the Olmec. Mainstream archaeologists reject this, because there is no archaeological, genetic or linguistic evidence for such a connection. The facial features are best explained as the sculptors’ style and the people of the region, and the full set of Olmec art, including small figurines, shows a range of features.
Damage and reuse
Many of the heads show signs of deliberate damage, such as chips, dents or removed faces. Some were moved from their first position and buried in ridges or pits. These events appear to be connected with changes in power at the centres, or with rites of retirement for monuments, but the details are uncertain. At San Lorenzo, several heads and other monuments were buried in lines, which later helped to preserve them.
Knowing when each head was made is difficult, because stone cannot be dated directly by radiocarbon dating. Archaeologists rely on the layers in which the heads were found, and on dates from associated charcoal and pottery. That is why the ranges are broad.
Links to what came next
The heads belong to the early phase of Gulf coast society. After the Olmec centres declined, later groups in the region continued to carve stone monuments, including stelae with dates and figures. The Isthmian script and the Epi-Olmec culture carry the story forward, and they show that the habit of recording rulers and events in stone did not stop with the heads. The heads remain a reminder of how much organisation, skill and shared belief lay behind the earliest monumental art of the Americas, as well as of how much about the people who made them is still unknown.