RNames - Scheme: Periods (ICS, 2020) (8)
Binning results
| Structured Name | Oldest | Youngest |
|---|---|---|
| 6b | Ordovician | Ordovician |
| 6c | Ordovician | Ordovician |
| = | Jurassic | Jurassic |
| A | Ordovician | Triassic |
| Aalenian | Jurassic | Jurassic |
| Aalter | Paleogene | Paleogene |
| Aaron Slate | Tonian | Cambrian |
| Aarons Pass Granite | Carboniferous | Permian |
| Ab-e-Haji | Jurassic | Triassic |
| Abad | Neogene | Neogene |
| Abadeh | Permian | Permian |
| Abadia | Devonian | Jurassic |
| Abadia | Devonian | Devonian |
| Abadia Beds | Jurassic | Jurassic |
| Abak | Ordovician | Ordovician |
| Abakurrie Limestone | Neogene | Paleogene |
| Abanico | Paleogene | Neogene |
| Abanico Brisa Mar | Neogene | Neogene |
| Abapã | Ediacaran | Cambrian |
| Abarsaj | Ordovician | Ordovician |