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TIMELINE | Lower or Early Jurassic |
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| Period | Subdivision | Timespan |
| Lower or Early Jurassic | Toarcian | 183,000,000 to 175,600,000 year ago |
| Pliensbachian | 189,600,000 to 183,000,000 years ago | |
| Sinemurian | 196,500,000 to 189,600,000 years ago | |
| Hettangian | 199,600,000 to 196,500,000 years ago |