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 |