Old Stone AgeTechnology Microlithic tools c. 20,000 BCENotable Tiny stone blades set into handles create composite tools and arrows. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Hand axes (Acheulean) → Wooden hunting spears → Spear-thrower (atlatl) → Microlithic tools Community notesLoading notes… Learn more ranked by votesBookDavid W. PhillipsonAfrican Archaeology ↗Editor's pickBookSteven MithenAfter the Ice: A Global Human History, 20,000-5000 BC ↗Editor's pickVideoSearch on YouTubemicrolithic tools explained ↗Editor's pick