The whole paper is about microliths, which are only known to be associated with anatomically modern humans (AMH, aka us). This is just "general background knowl

The whole paper is about microliths, which are only known to be associated with anatomically modern humans (AMH, aka us). This is just "general background knowledge" in the field, so they don't spend any time explaining or analyzing it in the paper. The particular typology they use here (shea's modes) is also more complicated on this point than the traditional clark framework where you can just say "mode 5 == AMH".