| P |
Some Permian text |
|---|
| C | | ⁋ |
Some Pennsylvanian text |
|---|
| M | |
|---|
Some Carboniferous text |
|---|
| D | | Late |
Some Late Devonian text |
|---|
| Middle |
Some Middle Devonian text |
|---|
| Early |
Some Early Devonian text |
|---|
Some Devonian text |
|---|
| S |
Some Silurian text |
|---|
| O | | Late |
Some Late Ordovician text |
|---|
| Middle |
Some Middle Ordovician text |
|---|
| Early |
Some Early Ordovician text |
|---|
Some Ordovician text |
|---|
| Є |
Some Cambrian text |
|---|
