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The important Howiesons Poort component here appears to date somewhat later (about 55–60 ka) than at several other sites in South Africa.
At the Acheulian site of Duinefontein, the dose rate changes, also thought to be caused by shell dissolution, are, on the other hand, very significant.
From 1960, Ronald Singer, Ray Inskeep, John Wymer, Hilary Deacon, Richard Klein and others suggested the excavation yielded the earliest known remains of anatomically modern humans and behaviourally modern humans in the world.
There is a 20 metres (66 ft) thick accumulation of deposits, both inside the caves and outside against the cliff face, proving that Klasies River Mouth people knew how to hunt small game, fish (later), gather plants and roots, cook There is a marked difference between the Paleolithic stone technology used in the earliest layers from 125,000 years ago, and the superior MST blades of the 70,000-year-old Howiesons Poort period that used raw material which had been 'mined' 20 kilometres inland.
Sometimes they collected tortoises and ostrich eggs in large quantities, as well as seabirds and marine mammals that could be found along the shore.