

It may be worth pointing out that the metal ages are used primarily for old world archaeology. The Americas utilize a different system that isn’t so bound to metallurgical ages.
Lithic > Ancient > Formative > Classic > Post-Classic
Each era is about mlre than material sciences, and specifically metallurgical ones, of the old world. (But let’s be clear, the Bronze age is so, so much more than bronzeworking. Sometimes that gets lost in the nomenclature.)
Arguably one could apply the american measurements similarly to old world history too, since these are all approximations for coherent discourse.






(I can only ever associate that quote with that scene from The Rock.)