| |
| Cambrian |
| Cambrian-Ordovician |
| Carboniferous |
| Carboniferous-Permian |
| Cretaceous |
| Cretaceous-Tertiary |
| Creteous |
| Devonian |
| Devonian-Carboniferous |
| Eocene (Bartonian) - Miocene (Aquitanian) |
| Jurassic |
| Jurassic-Cretaceous |
| Lower Carboniferous |
| Lower Cretaceous |
| Lower Permian |
| Lower Triassic |
| Lower-Middle Cretaceous |
| Middle Cretaceous - Tertiary |
| Middle Cretaceous-Tertiary |
| Middle Permian |
| Middle Triassic |
| Middle-Upper Triassic |
| Miocene (Aquitanian) - Pliocene (Gelasian) |
| NEOGENE (Holocene) - NEOGENE (Holocene) |
| Ordovician |
| Permian |
| Permian-Triassic |
| Pliocene (Gelasian) - Miocene (Messinian) |
| Quaternary |
| Silurian-Devonian |
| Silurian-Devonian-Carboniferous |
| Tertiary |
| Triassic |
| Triassic-Jurassic |
| Upper (Maastrichtian) - Eocene (Ypresian) |
| Upper Carboniferous |
| Upper Cretaceous-Tertiary |
| Upper Permian |
| Upper Triassic |
| <all other values> |
