Pronounced increase in hominin biface knapping skill half a million years ago in Britain

Flake scar patterning indicates Acheulean knappers were attempting to make thin, symmetrical handaxes with regular edges. In this study we quantify these elements of handaxe form and test the variation between the first two waves of Acheulean occupation in Britain. The results show a marked contrast between these groups in thinness, symmetry, and edge regularity. Handaxes from sites such as Fordwich dated to >0.56 Ma are crude, whereas those from sites including Boxgrove dated to ~0.48 Ma are highly refined. This contrast in biface skill outcomes seems to have been facilitated by the use of soft-hammers and platform preparation, both of which are evident at Boxgrove. Furthermore, it suggests an increase in hominin motor control around half a million years ago that may have implications for the emergence of speech.