Chapter 9 vocabulary
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An ordered arrangment of rock layers that is based on relative ages of the rocks and in which the oldest rocks are at the bottom.
A unit of geologic time that includes two or more periods.
A unit of geologic time that is longer than epoch but shorter than a era.
A subdivision of geologic time that is longer than a age but shorter than a period.
The process change by which new species develop from preexisting species over time.
The interval of time in geologic time scale from earths formation to the beginning of the Paleozoic era, from 4.6 billion to 542 million years ago
The geologic era that followed precambrian time and that lasted from 542 million to 251 million ago
An episode during which large number of species become extinct.
The geologic era that lasted from 251 million to 65.5 million years ago; also called the age of reptiles.
The current geologic era, which began 65.5 million years ago; also called the age of mammals.
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