Wikipedia
The Stillbay (also Still bay) industry is the name given by archaeologists A. J. H. Goodwin and C. van Riet Lowe in 1929 to a mid- Palaeolithic stone tool manufacturing style after the site of Stilbaai (also called Still Bay) in South Africa where it was first described. It may have developed from the earlier Acheulian types. In addition to Acheulian stone tools, bone and antler picks were also used.
Its start and end are calculated at 71.9 ka and 71.0 ka. At present, too few data exist to limit the 95% confidence intervals of these date to more than 4 to 5 ky. However, available data are consistent with a duration of less than 1 ky.
Sampson in 1974 questioned its existence on the grounds that sites were not properly described and they lacked stratigraphic integrity However, more recent work from sites such as Blombos Cave and Sibudu Cave attest to its existence.
It is broadly analogous to the Mousterian culture in Europe.
Olduvai Gorge has within its many ages of tools, some of the Stillbay variety.