3 rows, 5 columns:
#3, 5: That black material is probably the best of the group -- but, were large starting pieces available?
#2,1: Best work, 2nd best material. (Notice the gloss). That upper surface is the flake scar from a single hard hammer blade removal or "fluting" blow. (Surprisingly advanced technique!) Several small, "notching or "serrating" flake removals on each lateral edge -- made from the opposite, flat face. (I could make a nice point from that flake...)
#2,2: They were already striking off long, triangular-section "prismatic blades"!
#2,4: They were already making "prepared striking platforms" (bottom end) and striking off long, thin flakes!
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Bottom line: Surprisingly sophisticated lithic techniques for so very early in the development of "flintknapping"!!!
TXnMA
(Texas Archæological Steward)
P.S. I should have included the scale and doctor's name when cropping -- but was focussed too much on featuring the artifacts... :-(