London, Feb 3: Our early ancestors managed to evolve and journey across the earth by exchanging and improving their technology, researchers say after analysing Blombos Cave in South Africa.
The team looked closely at spear points made of stone as well as decorated ostrich eggshells to determine whether there was an overlap and contact across groups of Middle Stone Age humans.
The pattern they noticed is that when demographics change, people interact more.
"For example, we have found similar patterns engraved on ostrich eggshells in different sites. This shows that people were probably sharing symbolic material culture, at certain times but not at others," added Dr Karen van Niekerk, a UiB researcher and co-author.
This sharing of symbolic material culture and technology also tells more about Homo sapiens' journey from Africa to Arabia and Europe.
Contact between cultures has been vital to the survival and development of our common ancestors Homo sapiens.
The more contact the groups had, the stronger their technology and culture became.
"Contact across groups and population dynamics makes it possible to adopt and adapt new technologies and culture and is what describes Homo sapiens. What we are seeing is the same pattern that shaped the people in Europe who created cave art many years later," Henshilwood explained in an article published in the journal PLOS ONE.
Since its discovery in the early 1990s, Blombos Cave, about 300 km east of Cape Town, has yielded important new information on the behavioural evolution of the human species.
The cave site was first excavated in 1991 and field work has been conducted there on a regular basis since 1997 and is still ongoing.
Blombos contains Middle Stone Age deposits currently dated at between 100,000 and 70,000 years, and a Later Stone Age sequence dated at between 2,000 and 300 years.