The fossil in the fireplace
In 1924, workers at the Buxton Limeworks near Taung blasted a section of a limestone cliff, revealing a collection of fossils embedded in the rock. One was the skull of a primate, which eventually found its way to the mantelpiece of a director at the lime company. A visitor, Josephine Salmons, recognized its potential importance and informed her professor, an anatomist at the University of the Witwatersrand named Raymond Dart. Dart received two crates of fossil-bearing rock from the quarry and immediately spotted something important: a natural endocast—the fossilized interior of a braincase—and the corresponding face of a juvenile hominid.
The fossil was encased in a hard, cement-like breccia. Dart spent weeks meticulously cleaning the specimen, using tools as delicate as his wife's knitting needles. He slowly revealed the face, teeth, and jaw of a child he estimated to be three to four years old at the time of its death. In February 1925, just over two months after receiving the fossil, Dart published his findings in the journal Nature. He named a new species, Australopithecus africanus, meaning "southern ape of Africa." This was the first time an early human fossil had been identified on the continent, supporting Charles Darwin's hypothesis that Africa was the cradle of humanity.
A brain built for walking
The Taung Child's skull had a cranial capacity between 400 and 500 cubic centimeters, comparable to an adult chimpanzee. Yet, important anatomical features were distinctly human-like. The foramen magnum, the opening where the spinal cord exits the skull, was positioned directly underneath the cranium. In quadrupedal apes, this opening is located towards the back of the skull. The forward position in the Taung Child showed that the individual walked upright—a sign of bipedalism. This finding suggested that upright posture evolved well before large brains.
Dart’s conclusions were met with intense skepticism. The scientific establishment at the time, heavily influenced by the fraudulent "Piltdown Man" fossil from England, expected human ancestors to have large brains and ape-like jaws. The Taung Child, with its small brain and human-like dental structure, was the opposite. It took more than two decades for the discovery to gain widespread acceptance, a shift that occurred only after Robert Broom found more adult Australopithecus fossils at Sterkfontein and the Piltdown Man was exposed as a hoax in 1953. Today, the Taung Child is dated to approximately 2.8 million years old and is considered one of the most important paleoanthropological discoveries of the 20th century.