Pedra Furada

Stand still for a moment and listen. The dry wind moves through low, thorny scrub. The ground under your feet is pale and gritty, warm even in the shade. And ahead of you, a great wall of reddish sandstone rises out of the scrub. Near the top of that wall the rock simply stops. There is a hole, wide enough for the sky to pour through. This is Pedra Furada, the pierced stone.

You are in the Serra da Capivara National Park, in the state of Piauí, in the far interior of northeastern Brazil. The nearest town is São Raimundo Nonato, a quiet place a short drive away. This is not coastal Brazil, with its beaches and rainforest. This is the sertão, the dry backlands. The rock formations here are the edges of ancient plateaus, cut and shaped by water over a span of time that is hard to imagine.

The arch itself is a natural formation. Wind and water wore away the softer layers of sandstone and left the harder rock standing. Look closely at the cliff face. You can see horizontal bands, layer stacked on layer, in shades of rust, ochre and cream. Each band was once a bed of sediment. The hole cuts straight through them, so the arch shows the inside structure of the cliff, as clean as a slice through a cake.

The colour of the rock changes through the day. In the flat light of midday, the stone can look pale and almost dusty. In the early morning and late afternoon, it turns orange, then deep red. Many visitors come back in the evening for this reason. Lighting has been installed so the arch can also be seen after dark. It glows against the black sky, with the sounds of the night scrub all around.

The name Pedra Furada carries a second meaning, and this is where the story becomes much bigger than a rock. Close to the arch is a large rock shelter, known as the Toca do Boqueirão da Pedra Furada. Toca simply means a shelter or a hollow. Under the overhang of this cliff, archaeologists dug down through layer after layer of earth. What they reported finding there started one of the longest arguments in the study of the Americas.

The excavations were led by Niède Guidon, a Brazilian archaeologist trained in France. She began working in this region in the 1970s, after hearing about painted rocks in the backlands. Over many seasons, her team recorded hearths, charcoal and pieces of stone they interpreted as tools. Dating of the deepest layers suggested ages of tens of thousands of years, far older than most scholars then accepted for people in the Americas.

Here is the surprise most visitors miss. For decades, the textbook view held that the first Americans arrived from Asia relatively late, near the end of the last Ice Age. Pedra Furada challenged that view directly. Critics argued that the stones could have been broken by rockfall, and that the charcoal could come from natural fires. Supporters disagreed. The debate is still open today. You are standing beside one of the most contested archaeological sites on two continents.

Whatever the final answer, nobody disputes the art. The cliffs of Serra da Capivara hold an enormous number of painted sites, and Pedra Furada is among the best known. The paintings are mostly in red, made with mineral pigments. They show small human figures, deer, armadillos, birds and scenes that seem full of movement. People dance, hunt, gather in groups, and in some scenes appear to hold one another. The figures are small, so take your time.

Archaeologists often group many of these paintings into what they call the Nordeste tradition, meaning the northeastern style. It is known for lively, narrative scenes rather than single, isolated symbols. Notice how few straight lines there are. The bodies bend, the arms reach, the animals run. Researchers still debate what many of the scenes mean. Some may record rituals, some daily life. Some may be stories we will never fully read.

The second surprise is about protection. In 1991, UNESCO listed the Serra da Capivara National Park as a World Heritage Site, mainly for its rock art. The park also protects the caatinga. That is the dry, thorny forest around you, a type of vegetation found only in Brazil. In the long dry season, many trees drop their leaves and look almost dead. When the rains come, the same scrub turns green very quickly.

The walkways and platforms at the main sites were built to keep visitors at a safe distance from the paintings. Please follow them. Skin oils, dust and even breath can damage pigments that have survived for thousands of years. Local rules generally require you to visit with an accredited guide. Many of these guides grew up in the surrounding communities. They know the trails, the animals and the stories, and their work is part of how the park survives.

If you have time after your visit, the town of São Raimundo Nonato holds the Museu do Homem Americano, the Museum of the American Man. It displays material from the research in this region and explains the debate in more detail. Seeing the objects up close helps make sense of what you have looked at here. It also shows how much of this landscape is still under study.

Before you leave, turn back to the arch once more. Look through the hole at the patch of sky on the other side. Then lower your eyes to the small red figures on the rock. People have looked at this same cliff for a very long time... perhaps far longer than anyone once believed. As you walk away, listen to the scrub, feel the heat in the stone, and notice the light changing on the sandstone behind you.