A new scientific paper suggests that Homo sapiens from South Africa's southern Cape migrated out of Africa via the coast around 70,000 years ago. Ecologist Alan Whitfield and co-authors argue that coastal resources and skills enabled this journey. The hypothesis highlights marine foods and technologies from sites like Blombos Cave.
A scientific paper published in Transactions of the Royal Society of South Africa proposes the 'Coastal Hypothesis'. Co-authored by Alan Whitfield, Charles Helm, Renée Rust, Willo Stear and Francis Thackeray, it argues that a technologically advanced group of Homo sapiens left the southern Cape around 70,000 years ago. They moved out of Africa between 50,000 and 40,000 years ago, reaching Eurasia, Australia and the Americas.
Whitfield, an estuarine ecologist at the South African Institute for Aquatic Biodiversity, was inspired by finding an Early Stone Age hand axe near Elands estuary. 'I’d never seen one of these in my life,' he recalls. 'It fitted into my hand and it felt like holding something that was precious and so utilitarian.'
The southern Cape, between Cape Agulhas and Cape St Francis, offered rich resources including marine molluscs, fish and shellfish rich in omega-3 fatty acids. Whitfield notes these supported brain development, especially for women and children harvesting intertidal foods. 'Marine food, particularly many of the invertebrates in intertidal pools, and shellfish in particular, have very high levels of omega-3 fatty acids,' he explained.
Coastal life required knowledge of tides, lunar cycles and seasons, fostering cognitive skills. The region shows early symbolic behaviour at Blombos Cave and Pinnacle Point, plus Still Bay and Howiesons Poort technologies. Whitfield highlights bow-and-arrow technology from around 80,000 years ago as key. 'The big advantage of arrows is that you can approach a large animal without risking your life,' he says.
During Ice Age conditions from 90,000 to 80,000 years ago, the coast provided reliable food as the interior dried. The group followed the warm Agulhas Current eastward, offering an easier path than overland routes with assured seafood.