Cores are not the desired products of manufacture.
They were simply thrown away after being reduced
by striking off long narrow flakes of stone that were in
turn used to make the desired end product, in
(Morse 1983) for the production of micro-drills are most
successful when using bipolar percussion. This technique
involves placing a core on an anvil (another rock) and
striking the core from above with a hammerstone. The
flakes produced by this process tend to have flat release
surfaces and little bulb of percussion. Bipolar percussion
produces cores that are barrel shaped and flakes removed
which the blades were fracturing or separating from the
core. Some of the flake removals were cleanly fractured
from end to end while others were hinging off only half
way down the length of the core.