RNames - Scheme: Ordovician time bins (Webby et al., 2004) (9)
Binning results
| Structured Name | Oldest | Youngest |
|---|---|---|
| Acodus deltatus / Paroistodus proteus | 1b | 2a |
| Acodus kechikaensis | 1d | 2b |
| Acoite | 2a | 2c |
| Acoite Lower | 1b | 2a |
| Acoite Upper | 2c | 4a |
| Acontiodus linxiensis | 2c | 3a |
| Acrograptus balticus | 2b | 3a |
| Acrograptus ellesae | 4b | 4b |
| Acrograptus filiformis | 2b | 2b |
| Acton Scott | 5c | 5c |
| Actonian | 5c | 5c |
| Adelograptus | 1a | 1b |
| Adelograptus / Clonograptus | 1b | 1d |
| Adelograptus / Paradelograptus antiguus | 1a | 1d |
| Adelograptus hunnebergensis | 1b | 1b |
| Adelograptus tenellus/ Anisograptus richardsoni | 1b | 1b |
| Adelograptus victoriae | 1b | 1d |
| Adelograptus victoriae/ Paradelograptus antiquus | 1b | 1b |
| Adenograptus tenellus | 1b | 1b |
| Adila | 6a | 6b |