| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Aalenian |  |  |  |  |
| 3 | System/ Period | Series/ Epoch | Stage/ Age | Age (Ma) | Age (Ma) |
| 4 | Cretaceous | Lower/ Early | Berriasian | younger | younger |
| 5 | Jurassic | Upper/ Late | Tithonian | ~145.0 | 152.1 |
| 6 | Jurassic | Upper/ Late | Kimmeridgian | 152.1 | 157.3 |
| 7 | Jurassic | Upper/ Late | Oxfordian | 157.3 | 163.5 |
| 8 | Jurassic | Middle | Callovian | 163.5 | 166.1 |
| 9 | Jurassic | Middle | Bathonian | 166.1 | 168.3 |
| 10 | Jurassic | Middle | Bajocian | 168.3 | 170.3 |
| 11 | Jurassic | Middle | Aalenian | 170.3 | 174.1 |
| 12 | Jurassic | Lower/ Early | Toarcian | 174.1 | 182.7 |
| 13 | Jurassic | Lower/ Early | Pliensbachian | 182.7 | 190.8 |
| 14 | Jurassic | Lower/ Early | Sinemurian | 190.8 | 199.3 |
| 15 | Jurassic | Lower/ Early | Hettangian | 199.3 | 201.3 |
| 16 | Triassic | Upper/ Late | Rhaetian | older | older |
| 17 | Subdivision of the Jurassic system according to the ICS, as of 2017. | Subdivision of the Jurassic system according to the ICS, as of 2017. | Subdivision of the Jurassic system according to the ICS, as of 2017. | Subdivision of the Jurassic system according to the ICS, as of 2017. | Subdivision of the Jurassic system according to the ICS, as of 2017. |

Question: What is the Aalenian age?
Answer: The Aalenian is a subdivision of the Middle Jurassic epoch/series that extends from 170.3 Ma to 174.1 Ma.