All of these tools have what I believe to be residual material on what would be the working surface.  The material respective to each tool is not present anywhere else on the tool, only on the bottom.  Crude stone tools should be an important resource in material analysis archaeology.  Material ranges from chalky white concretion on tool in upper left, to black, pitch-like substance on tool in lower right.  They all, of course, fit the hand  perfectly.

 

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