In 1947, Wilfred Eitzman, a local schoolteacher, visited the Makapansgat Limeworks in Limpopo, South Africa, where he collected a number of fossil remains, including those of extinct baboon species, which originated from the Australopith-bearing, Member 3 Grey breccia layers.
Dart published numerous journal articles on the subject of the ODK hypothesis, which received considerable backlash from his contemporaries.