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| the largest division of geologic time |
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| a subdivision of a geologic period |
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| a unit of geologic time that include two or more |
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| the standard method used to divide the earch long natural history into manageable part |
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| era that begin about 66 million year year ago, known''as the age of mammal |
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| the rate at which specise die |
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| occur when a large proportion of the earth specise go extinct in a relatively short period of time |
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| an example of a specise at support the continental drift theory |
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| era that 245 million year ago ,known as the age of diosaurs |
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| era that began about 544 million year ago and almost lasted about 300 million year ago |
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Definition
| a subdivision of the eras in geologic time |
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