A team of paleontologists from the Chinese Academy of Sciences recently sifted through ten kilograms of coal in northwestern China and found the oldest known amber fragments on record, dating back 385 million years to the Middle Devonian period—150 million years before the first dinosaurs 4. The discovery is a trophy for deep time, but the real story is not the resin itself. It is the ancient cognitive architecture that resin helps us infer, and how that architecture connects a Devonian forest to a baboon in a lab today.
The amber is a fossilized snapshot of an ecosystem so remote that trees had only recently evolved the ability to produce resin. That resin trapped spores, microbes, and perhaps the earliest terrestrial arthropods, preserving a moment in the slow assembly of complex life on land. What the amber cannot preserve is the mind of the creatures that lived beneath those trees. For that, we turn to a study published in Proceedings of the National Academy of Sciences showing that baboons and macaques share with human children and adults a fundamental intuition for geometry 1. Jessica Cantlon, the neurocientífica who led the work, states plainly: "Los monos, los niños y los adultos parecían pensar en las relaciones geométricas fundamentalmente de la misma manera."
This is not a cute coincidence. It is evidence that a capacity for spatial reasoning—the ability to recognize angles, distances, and relative positions—was already present in the common ancestor of primates tens of millions of years ago. That capacity did not emerge with Homo sapiens or with symbolic language. It is older than our species, older than our genus, and, if we follow the amber back, older than the first dinosaurs. The same neural wiring that lets a baboon navigate a rocky outcrop probably allowed a Devonian arthropod to find shelter in a resin drip.
The temptation is to read this as a triumphalist story of continuity: deep time reveals that we are not special. But the evidence demands a more sober interpretation. The French researchers who recently identified the neural mechanisms behind the Proust effect—the phenomenon where a scent triggers vivid, emotionally charged childhood memories—showed that repeated positive olfactory experiences in early life leave a permanent trace in the brain 3. That trace is a form of memory that binds an organism to a specific place. Geometry gave our ancestors the map; smell gave them the anchor.