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  enlarge             <kan10-handax4> -- Hand blades or axes -- Two of the obviously flaked tools that have nearly eroded away flake scars on one side from lying exposed for an extreme amount of time before being buried by the 1 to 2 millionyears ago McPherson Formation Smokey Valley River alluvial muds and the small one being resharpened or tested at a much more recent time as shown by the different amount of erosion.  |