Stratigraphic time
| This age is part of | |
|---|---|
| Phanerozoic | 542 - recent |
| Mesozoic | 251 - 65.5 |
| This age is subdivided to | |
|---|---|
| Upper Jurassic | 161.2 - 145.5 |
| Middle Jurassic | 175.6 - 161.2 |
| Lower Jurassic | 199.6 - 175.6 |
| Number of records | |
|---|---|
| Taxa | 347 |
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