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Dinosaur and Paleontology Dictionary |
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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| EON | ERA | PERIOD |
| P H A N E R O Z O I C 540 mya through today |
CENOZOIC | Quarternary 1.8 mya-today First humans, mammoths, mastodons, saber-toothed cats. |
| Neogene 24-1.8 mya Australopithecus appears. First sheep, cattle, modern whales, bears, mice, rats, apes, monkeys, dogs, modern birds appear. |
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| Paleogene 65-24 mya First deer, cats, pigs, tapirs, and rhinos, elephants, horses, owls, shrews, hedgehogs, and rabbits evolve. |
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| MESOZOIC | Cretaceous 146 to 65 mya First flowering plants, snakes, crocodilians. K-T mass extinction at end kills dinosaurs, and others |
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| Jurassic 208 to 146 mya Abundant dinosaurs, first birds. |
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| Triassic 245 to 208 mya First mammals, dinosaurs, frogs, turtles, crocodyloformes. |
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| PALEOZOIC | Permian 280 to 245 mya Sail-back reptiles. Amphibians abundant. Pangaea forms. Ends with mass extinction. |
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| Carboniferous 360 to 280 mya Widespread coal swamps. First reptiles, winged insects. |
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| Devonian 408 to 360 mya First amphibians, sharks, bony fish, ammonoids, and spiders. Many fish. |
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| Silurian 438 to 408 mya First insects, vascular plants on land. |
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| Ordovician 505 to 438 mya First land plants, corals, Nautiloids. Ends in mass extinction. |
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| Cambrian 540 to 500 mya Explosion of life forms. First shellfish, primitive fish, trilobites, corals, mollusks. |
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| PROTERO- ZOIC 2.5 billion years ago to 540 mya |
- | Vendian 600 to 540 mya Sponges, multi-celled animals appear. Supercontinent Rodinia. |
| - | Early Proterozoic 2.5 billion years to 600 mya Oxygen build-up on Earth. First multi-cellular life. |
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| ARCHEO- ZOIC 3.9 to 2.5 billion years ago |
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| HADEAN 4.6 to 3.9 billion years ago |
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