GSSP — Glossary — Stratum Study

Global Boundary Stratotype Section and Point: the physical outcrop and marker horizon, ratified by the ICS, that defines the base of a stage — the “golden spike”. The base of the Danian at El Kef, Tunisia is defined by the iridium anomaly.

Sources

International Commission on Stratigraphy — International Chronostratigraphic Chart
Macrostrat — Interval definitions (CC BY 4.0)

Cite this article

Stratum Study. "GSSP" (Glossary). Stratum Study pack 2026.09, as of 2026-09-16. https://stratum.black/study/glossary/gssp. Accessed 2026-09-20.

BibTeX · CSL-JSON

@misc{stratum-gssp,
  title        = {GSSP},
  author       = {{Stratum Study}},
  howpublished = {\url{https://stratum.black/study/glossary/gssp}},
  year         = {2026},
  note         = {Glossary article, Stratum Study pack 2026.09, as of 2026-09-16; sources: stratum. Accessed 2026-09-20.}
}

Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.