Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
key beds  | |
|---|---|
| UF | beds, key |
| index beds | |
| RT | stratigraphy |
| marker beds | |
| SN | Use for stratigraphy. Before 1978, search marker beds. |
| Data sets | Publications | Expeditions | Thesaurus |
| key beds | |
|---|---|
| UF | beds, key |
| index beds | |
| RT | stratigraphy |
| marker beds | |
| SN | Use for stratigraphy. Before 1978, search marker beds. |