I asked ChatGPT 4 if it could add any entries. It came up with the following. I haven't checked for veracity, I'm using it more as an interesting exercise/start

I asked ChatGPT 4 if it could add any entries. It came up with the following. I haven't checked for veracity, I'm using it more as an interesting exercise/starting point for checking for gaps: Origin of life (3.5-3.8 bya): First single-celled organisms. Eukaryotes emerge (1.6-2.1 bya): First eukaryotic cells. Ediacaran biota (635-541 mya): Soft-bodied multicellular life. Cambrian explosion (541 mya): Rapid life diversification. Carboniferous Period (359-299 mya): Winged insects, high oxygen. Permian-Triassic extinction (252 mya): Largest mass extinction. Mammals evolve (225 mya): Small, nocturnal mammals. First birds (160 mya): Birds from dinosaurs. K-Pg extinction event (66 mya): Dinosaurs extinct, mammals rise. Grasses evolve (70-55 mya): Emergence of grasses. Ice Ages (2.6 mya - present): Repeated ice ages. Agricultural Revolution (12k-10k years ago): Agriculture emerges. Writing systems (5k-4k years ago): Writing invented. Industrial Revolution (18th-19th centuries): Rapid industrialization. Atomic Age (1945-present): Nuclear technology era.