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| Ma | PERIOD | EVENT |
| before 570 | Precambrian | first organisms |
| 570 - 505 | Cambrian | first vertebrates
first Agnatha - Ostracoderms |
| 505 - 438 | Ordovician | Ostracoderms diversify |
| 438 - 408 | Silurian | first Placoderms
first Acanthodians first Osteichthyes (bony fish) |
| 408 - 360 | Devonian | "AGE OF FISH"
first Chondrichthyes first amphibians Cladoselache |
| 360 - 320 | Mississippian | Hybodonts |
| 320 - 286 | Pennsylvanian | first reptiles |
| 286 - 245 | Permian | massive extinction at Permian/Triassic
extinction of Placoderms extinction of Acanthodians |
| 245 - 208 | Triassic | first dinosaurs
first mammals |
| 208 - 144 | Jurassic | first birds
first Chimaeriformes first Rajiformes |
| 144 - 66 | Cretaceous | extinction of Hybodonts
modern sharks ~ 100 Ma (Neoselachii) extinction of dinosaurs |
| 66 - 10 000 years | Tertiary | Megalodon
first hominids ~ 4 Ma |
| 10 000 years to present | Quaternary |
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bharris@chat.carleton.ca