Archaeology of middle Pleistocene lacustrine and spring paleoenvironments in the Kapthurin Formation, Kenya

► Blade technology originates 150,000 years earlier than previously thought. ► Middle Pleistocene technologies contain more variation than previously thought. ► Springs are a focus of hominin subsistence behavior in semi-arid environments. ► Middle Pleistocene landscape use is similar to that of the late early Pleistocene.