OK, it appears that there is a whole science devoted to analyzing microliths... very small stone blades and bladelets. Oh joy...
Anyway, there are microlith transverse arrowheads (early) and "bigger" transverse arrowheads (that came later). Microlith technology was used on the first arrows, followed by "leaf" forms (bifaces), followed by oblique and bigger transverse forms, followed by "barb and tang" arrowheads.
I think I'll be able to reproduce enough arrowheads this weekend to represent each time period.
Then I can match the arrowhead types to the bows of the respective periods. Oh, what fun.