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In 1924, Dart discovered the first Australopithecus africanus fossil, an extinct hominin closely related to humans. His colleague, Professor Robert Burns Young from the Buxton Limeworks, had sent Dart two crates of fossils from the small town of Taung in the North West Province of South Africa.[1] Upon seeing the fossils, Dart immediately recognized one as being an early human because its brain dimensions were too large for a baboon or chimpanzee.[2][3] Blasting had exposed a breccia-filled cave and the child's skull had come to light together with several fossilized monkeys and hyraxes. M. de Bruyn had noticed their unusual nature in November 1924 and informed the Limeworks manager, Mr. A.E. Spiers.
As Dart was not part of the scientific establishment, and because he found the fossil in Africa, and not Europe or Asia, where the establishment supposed man's origins, his findings were initially dismissed.[4]
Dart's closest ally was Robert Broom whose discoveries of further Australopithecines (as well as Wilfrid Le Gros Clark's support) eventually vindicated Dart, so much so that in 1947 Sir Arthur Keith said "...Dart was right, and I was wrong". Keith made this statement referring to his dismissal and skepticism of Dart's analysis of the 'Taung Child' as an early human ancestor; Keith thought that it was more likely to be an ape, yet later research by Broom confirmed Dart's theories.
Not all of Dart's ideas are accepted now. His assertion that gazelle long-bones found in association with A. africanus were used as tools is unproven and largely dismissed.[citation needed] Dart also originated the killer ape theory. Although some other anthropologists, notably Robert Ardrey, defended and further developed the theory, it is still widely questioned.[citation needed] Dart envisioned damage to fossilized bones was caused by meat-eating proclivities of A. africanus, but C.K. Brain was able to show the damage was caused by large carnivores feeding.