The Evolutionary Timeline
| Life Forms | Millions of Years Ago | Period | Era |
| Humans | 0 | Quaternary | Cenozoic |
| Mammals arrive | 50 | Tertiary | |
| Dinosaurs flourish, Tyrannosaurus rex, Triceratops, etc | 100 | Cretaceous | Mesozoic |
| Reptiles, pre-bird, archaeopteryx | 150-175 | Jurassic | |
| Proliferation of land plant life | 200 | Triassic | |
| Reptile branches, pre mammalian forms. Dinosaurs arrive. | 250 | Permian | Paleozoic |
| Amphibians and first reptiles on land | 300 | Carboniferous | |
| plants from the sea began to colonize the land. | 350 | Devonian | |
| Vertebrate fish, jawless, | 425 | Silurian | |
| Marine Invertebrates, trilobites, cephalopods... | 450-500 | Ordovician | |
| Trilobites, snails, brachipods | 500-575 | Cambrian | |
| multicellular life forms. Soft bodied animals, worms, jellyfish, etc. | 600-650 | Algonkian | PreCambrian |
| Life begins 3.5 billion years ago | |||
This chart was adapted from an insert called the Tower of Time by John Gurche as reproduced in The Thread of Life: The Smithsonian Looks at Evolution, by Roger Lewin, Smithsonian Books, Washington, D.C., Distributed by W.W. Norton & Company, New York, N.Y. 1982.
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Matthew J. Slick, 1996 - 2006