Scale of development metals with tools.
Osteodonterkeratic - Usage of Bone, Shell and natural materials only, no stone tool shaping, random rocks could be picked up and thrown or bashed on something - but no deliberate manufacture. Like throwing sticks and clubs. - Users - Apes, Australopithecus and earlier hominids like Ardipithecus and Proconsul.
Manuportic - Deliberate carrying and shaping of rocks to sites, like bashing a rock on a bone and harvesting them - Australopithecus, Chimps, Paranthopus
Stone Age - Oldowan - Basic usage of rocks as choppers, bashing two stones - Homo Habilis and possibly Paranthropus, Tasmanians, basic stick spears
Acheulian - Handaxes - better shaping, multi use tools - Homo Erectus and Archaic Homo Sapiens, throwing spears, bolas
Mousterian - Scrapers, Axes, crude blade technology associated with Neanderthals and Denisovans, some more primitive Australian aborigines, hafted spears
Aurignacian to Magdalenian - Modern humans, complex tools, all flakes, use of many rocks like chert, flint and obsidian, sewing needles, scrapers, flakes and blades - Modern day hunter gatheries like Mbuti pygmies, Bushmen, Aborigines, Inuit. Palelothic level.
Mesolithic - Complex scrapers and blades, microliths, complex needles, spears, woodworking and blades - Maori, basic Africans, Tierra del Fuegans.
Neolithic - Polished stone tools like adzes, flint scrapers and choppers, blades, more microliths, farming, basic pottery - Many Amazonian and New Guinean tribes, native South sea Islanders, more advanced Maori.
Chalcolithic - Copper Age - like neolithic, better pottery - usage of copper, gold silver - able to smelt metals with low melting points, no alloys though - Maya, Aztec, Incas, Chavin, Adena etc - Otzi is from the copper age.
Bronze Age - Usage and smelting of Bronze (Alloy of Tin and Copper), usage of many metals, fine work - however still heavily using stone tools, especially flint, metal was around but it was rare and prestigous and stone and natural materials mostly used.
Iron Age - Usage and smelting of Iron, IRON was an expensive and hard to make metal due to its high melting point and complex bellows/smelter needed. Most everyday usage was with Bronze and easier metals. Stone tools fell out of usage. Basic coinage was possible with hammering mostly pure or near pure lumps of gold, silver and copper.
Steel age - Romans, Chinese and Japanese around early centuries AD, late BC added coke to iron, creating a harder steel which was perfect for better fighting and stronger materials. Coins still hammered, but more complex alloys like billon and mixxed silver could be made.
Cast iron/Stainless steel - modern technology and metallurgy. Invention of the Screw Press c.1550 and modern steam engine produced coins (late 1700s), widespread adoption of machine made/industrial coinage around 1850.
I love coins. Especially silver, gold and anything really old.
Member of the Royal Numismatic Society of New Zealand and the Auckland Numismatic Society