Geologic Timescale
The Columbia Encyclopedia, Sixth Edition | Date: 2008
Geologic Timescale
| Geologic Timescale |
|
|
| Era
|
Period
|
Epoch
|
Approximate duration (millions of years)
|
Approximate number of years ago (millions of years)
|
|
|
| Cenozoic
|
Quaternary
|
Holocene
|
10,000 years ago to the present
|
|
| Pleistocene
|
2
|
.01
|
| Tertiary
|
Pliocene
|
11
|
2
|
| Miocene
|
12
|
13
|
| Oligocene
|
11
|
25
|
| Eocene
|
22
|
36
|
| Paleocene
|
71
|
58
|
| Mesozoic
|
Cretaceous
|
|
71
|
65
|
| Jurassic
|
|
54
|
136
|
| Triassic
|
|
35
|
190
|
| Paleozoic
|
Permian
|
|
55
|
225
|
| Carboniferous
|
|
65
|
280
|
| Devonian
|
|
60
|
345
|
| Silurian
|
|
20
|
405
|
| Ordovician
|
|
75
|
425
|
| Cambrian
|
|
100
|
500
|
| Precambrian
|
|
|
3,380
|
600
|
Author not available,
GEOLOGIC TIMESCALE.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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geologic timescale
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... or absolute age of any part of geologic time. Of the numerous timescales, the most common is based on geologic time units, which divide time into ... recent periods, into epochs. In some timescales, epochs are further divided into ages. Each geologic time chart varies, depending on ... are ...
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