He tested a method developed by Barnes ( 1939 ) who had compared frequency of obtuse angles on eoliths , natural fractures , and artifacts .
Payen ( 1982 ) studied flake scar angles as traits for distinguishing artifacts from geofacts .
Payen tested a method developed by Barnes ( 1939 ) who had compared frequency of obtuse angles on eoliths , natural fractures , and artifacts .
Payen ( 1982 ) studied flake scar angles as traits for distinguishing artifacts from geofacts .