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TIMELINE | Upper Cretaceous |
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| Period | Subdivision | Timespan |
| Upper Cretaceous | Maastrichtian | 72,100,000 to 66,000,000 year ago |
| Campanian | 83,600,000 to 72,100,000 years ago | |
| Santonian | 86,300,000 to 83,600,000 years ago | |
| Coniacian | 89,800,000 to 86,300,000 years ago | |
| Turonian | 93,900,000 to 89,800,000 years ago | |
| Cenomanian | 100,500,000 to 93,900,000 years ago |