Thanks TXnMA.
As a lithic technologist, I'll agree that all the pictured artifacts are, indeed, artifacts -- and not "accidental geofacts".
All of them are "faceted", from multiple, purposeful flake removals, and many removals show clear evidence of a "hard hammer" (aka "hammerstone") strike.
A further, convincing point is that the materials are granular, tough materials that will only produce a thin, sharp flake when submitted to well-directed, high velocity, shockwave-initiating percussive strikes. Such precise impacts are exceedingly rare in nature -- and multiple such strikes on a single small stone are so improbable as to be essentially non-existent in nature.
And, several of them even exhibit prepared "striking platforms" for flake removals!
Whoever made them may have been "primitive" -- but, they definitely exhibited technical knowledge and skill.
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(To anyone who thinks otherwise -- I challenge you to pick up some rocks and duplicate these "crude" artifacts...) '-)
Thanks TXnMA.
