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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 Two or more geological eras form an Eon, which is the largest division of geologic time, lasting many hundreds of millions of years. |
ERA Two or more geological periods comprise an era, which is hundreds of millions of years in duration. |
PERIOD The period is the basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years. |
EPOCH An epoch is a division of a geologic period; it is the smallest division of geologic time, lasting several million years. |
AGE An age is a unit of geological time which is distinguished by some feature (like an Ice Age). An age is shorter than epoch, usually lasting from a few million years to about a hundred million years. |
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Dinosaur and Paleontology Dictionary |
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