| 1 | A | B | C |
| --- | --- | --- | --- |
| 2 | Furongian - Subdivisions |  |  |
| 3 | Epoch | Stage | Age (mya) |
| 4 | Lower Ordovician | - | - |
| 5 | Lower Ordovician | Floian | 477.7 |
| 6 | Lower Ordovician | Tremadocian | 485.4 |
| 7 | Furongian | - | - |
| 8 | Furongian | Stage 10 | 489.5 |
| 9 | Furongian | Jiangshanian | 494 |
| 10 | Furongian | Paibian | 497 |
| 11 | Series 3 | - | - |
| 12 | Series 3 | Guzhangian | 500.5 |
| 13 | Series 3 | Drumian | 504.5 |
| 14 | Series 3 | Stage 5 | 509 |

Question: How long did Furongian last?
Answer: Furongian lasted from 497 million years ago.