Chapter 9 vocabulary
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Ordered arrangement of rock layers.
Eons divided into smaller units of geologic time.
Eras are divided into shorter time units.
Divide a period into shorter time units.
The gradual development of new organisms for preexisting organisms.
Time interval that began with formation of Earth and ended about 542 million years ago.
Began about 542 million years ago and ended about 251 million years ago.
An enormous number of species died.
Began about 251 million years ago and ended about 65 million years ago.
The division of geologic time that began about 65 million years ago and includes the present period.
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