Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
stratigraphic boundary  | |
|---|---|
| NT | K-T boundary |
| Permian-Triassic boundary | |
| UF | boundaries, stratigraphic |
| RT | allostratigraphy |
| stratigraphy | |
| stratigraphic columns | |
| stratotypes | |
| SN | Before 1993, also search boundary which was used for this concept from 1978-1992. Use in combination with appropriate age terms (list E). Added to Thesaurus in 1993. |