| Geological Period |
Time before present (millions of years) |
| Quaternary and Recent |
1.8 to present |
| Tertiary |
65 to 1.8 |
| Cretaceous |
145 to 65 |
| Jurassic |
213 to 145 |
| Triassic |
248 to 213 |
| Permian |
286 to 248 |
| Carboniferous |
360 to 286 |
| Devonian |
410 to 360 |
| Silurian |
440 to 410 |
| Ordovician |
505 to 440 |
| Cambrian |
544 to 505 |
| Precambrian Time |
4500 to 544 million years ago |
| Timescale uses breakpoints defined
in the
USGS 2001 scale
|
|
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