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Chapter 9
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Geologic column
A time line of earths history
era
An eon divided into smaller units of time
period
Eras divided into smaller units of time
Epochs
a period divided into a smaller unit of time
Evolution
the gradual development of new organisms from preexisting organisms
Precambrian time
the time interval that began with the formation of earth and ended about 542 million years ago
paleozoic era
the geological era that began about 542 million years ago and ended about 251 million years ago
mass extinction
an enormous number of species dead
mesozoic era
the geologic era that began about 251 million years ago and ended 65 million years ago
Cenozoic era
the division of geological time that began about 65 million years ago and that includes the present period
Author
bfoster
ID
267324
Card Set
Chapter 9
Description
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Updated
2014-03-24T13:17:53Z
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