Here is a group of Cache/Preform Blades and knapping stone's with abrader's(quarter for scale, size 1"). On the right side they are kinda in steps,
from close to done to finished Blade. Spall's (large flakes) were knocked off the "mother" stone and by percusion (hitting with antler or stone rod
shaped tools)the preform was roughly made into shape. The Blade would be finished by Pressure Flaking into final shape. They are called Cache Blades
because they are normally found stacked together, sometimes numbering in the 100's. A Cache was like a bank, a safe place to store something for
future use, they would bury them where they would come back and get them on the next hunt. Called Preforms also because they are like 1/2 way done and
need only a little more work to be a Blade. The stones in the middle with the "V" groove's and the one above it are Abrader's, used to help make
Platforms for taking off flakes in a controlled manner. They were used by grinding the edge to make a flat spot for better "bite" of the knapping
tool.
The Rod shaped stones are Knapping tool's, the little dude was used for In-Direct Percussion, end was placed were need and top end was hit, this put
the pressure in one small spot of the piece and helped to make nice deep nocthes and to work through any " stack"(portion of blade that is harder
then rest of the piece and that doesnt want to come off).