Ethiopian Rift, is known to be one of the richest early Middle Stone Age (MSA) sequences in
East Africa. The technological assessment of three main sites provides evidence of major
changes in the production of convergent tools over a period from before 280 ka (thousands
of years ago) to ca. 100 ka. Important diachronic changes are identified in the manufacturing
process of convergent tools, by shaping or retouching of predetermined points, and in the …