Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Alexandrian  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Silurian | |
| ....Lower Silurian | |
| .....Alexandrian | |
| UF | Alexandrian Series |
| SN | North American provincial series. Lower Silurian (above Cincinnatian of Ordovician, below Niagaran). |
| Alexandrian Series | |
|---|---|
| USE | Alexandrian |