A term for South African early Middle Stone Age artifact assemblages of the late Middle or early Late Pleistocene, occurring mainly in the Transvaal although related material is also found further south. It belongs to the general group of industries based upon the removal of flakes from prepared cores but is differentiated from other contemporary industries of this type by the presence of large numbers of long parallel-sided flake-blades (many of which have minimal retouch or use damage on the sides). The best sequence showing the development of the Pietersburg industry is at the Cave of Hearths in the northern Transvaal. The chronology is still poorly defined, but is roughly 60,000-20,000 BC or after.