A new study by scientists at the University of the Witwatersrand suggests that at about 58,000 years ago, Stone Age humans began to settle down, staying in one area for longer periods. The research also provides a potential answer to a long-held mystery: why older, Howiesons Poort complex technological tradition in South Africa, suddenly disappear at that time. Phys.Org reports: The Howiesons Poort at Sibudu contains many finely-worked, crescent-shaped stone tools fashioned from long, thin blades made on dolerite, hornfels and, to a lesser extent, quartz. These "segments," as they are called, were hafted to shafts or handles at a variety of angles using compound adhesives that sometimes included red ochre (an iron oxide). A diverse bone tool kit in the Howiesons Poort includes what may be the world's oldest bone arrowhead. Certainly a variety of hunting techniques was used perhaps including the first use of snares for the capture of small creatures. The animal remains brought to Sibudu reflect this diversity for there are bones from large plains game like zebra, tiny blue duiker, and even pigeons and small carnivores. Soft, clayey ochre pieces were collected in the Howiesons Poort perhaps at a considerable distance From Sibudu. Clayey ochre is useful for applying as paint. The beautiful Howiesons Poort industry with its long, thin blades is replaced at 58,000 years ago by a simple technology that could be rapidly produced. Coarse rocks like quartzite and sandstone became popular. These could be collected close to Sibudu. Post-Howiesons Poort tools were part of an unstandardized toolkit with triangular or irregularly-shaped flakes. Tiny scaled pieces were also produced using a bipolar technique (in the simplest terms this involves smashing a small piece of rock with a hammerstone). The study has been published in the journal PlosOne.