Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
marker beds  | |
|---|---|
| UF | beds, marker |
| RT | seismology |
| event stratigraphy | |
| key beds | |
| SN | Before 1978, term also included use for key beds (stratigraphy). As of 1978, term is restricted for use in seismology. |