| SYSTEMATIC BIOLOGY | RETURN TO THE KINGDOM VIRIDIPLANTAE | ||||
| HOME | SYLLABUS | WEEKLY ASSIGNMENTS | J. SYSTEMATIC BIOLOGY | TAXA OF LIFE | |
|
THE GEOLOGICAL TIME SCALE |
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|
EON |
ERA |
PERIOD |
MARGULIS & SCHWARTZ (1998) |
BOLD, ET AL. (1987) |
|
PHANEROZOIC |
CENOZOIC |
QUATERNARY |
0-2.5 |
0-2.5 |
|
TERTIARY |
2.5-66 |
2.5-65 |
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|
MESOZOIC |
CRETACEOUS |
66-144 |
65-136 |
|
|
JURASSIC |
144-213 |
136-190 |
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|
TRIASSIC |
213-238 |
190-225 |
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|
PALEOZOIC |
PERMIAN |
248-286 |
225-280 |
|
|
PENNSYLVANIAN |
286-360 |
280-325 |
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|
MISSISSIPPIAN |
325-345 |
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|
DEVONIAN |
360-408 |
345-395 |
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|
SILURIAN |
408-438 |
395-430 |
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|
ORDOVICIAN |
438-505 |
430-500 |
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|
CAMBRIAN |
505-590 |
500-570 |
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|
PROTEROZOIC |
VENDIAN |
520-700 |
570-3100 |
|
|
RIPHEAN |
700-1800 |
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|
APHEBIAN |
1800-2600 |
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|
ARCHEAN |
2600-3900 |
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|
HADEAN |
3900-5000 |
3100-4700 |
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Geologic time scale and approximate dates for the respective time intervals as given in Margulis & Schwartz (1998) and Bold, et al. (1987). Dates are in millions of years.