GEOLOGICAL TIME AND ANIMAL FORMS
| CAINOZOIC (Recent life) | QUATERNARY (Age of Man) | HOLOCENE |
| PLEISTOCENE | ||
| TERTIARY (Age of Mammals) | PLIOCENE | |
| MIOCENE | ||
| OLIGOCENE | ||
| EOCENE | ||
| MESOZOIC (Middle life) | SECONDARY (Age of Reptiles) | CRETACEOUS |
| JURASSIC | ||
| TRIASSIC | ||
| PALAEOZIC (Ancient life) | PRIMARY (Age of Amphibians) (Age of Fishes) Age of Marine Invertibrates) | PERMIAN |
| CARBONIFEROUS | ||
| DEVONIAN | ||
| PROTOZOIC (Earlier life) | SILURIAN | |
| ARCHAEOZOIC (Primitive life) | ORDOVICIAN | |
| CAMBRIAN |
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