Santonian
Fourth Late Cretaceous age, named after Saintes and the distinctive fossiliferous local marine strata.
Language and route: Scientific French from Latin local ethnonym Santones via French Saintes. Ancient Santones → Roman Saintes (Mediolanum Santonum) → French Santonien → English Santonian.
Literal gloss: ‘of/from Saintes’ (geographical; not a Greek compound)
The name and its history
Henri Coquand · 1857; fuller explanation 1858
- What does the word literally mean?
- ‘of/from Saintes’ (geographical; not a Greek compound)
- What did the original author mean?
- Coquand distinguished oyster- and echinoid-bearing limestones around Saintes between the Coniacian and Campanian divisions.
- Why was the name needed?
- His large Senonian division concealed distinct rock and fossil successions along the Charente; local reference sections made the stages usable.
- What evidence supported the original concept?
- Marine fossils, especially oysters and echinoids, and mapped limestone–chalk units around Saintes justified the subdivision.
- How has geology changed the concept?
- Today it is a globally recognised Late Cretaceous age whose formal boundary criteria do not depend on Coquand’s oysters at Saintes.
Further historical context
Coquand distinguished oyster- and echinoid-bearing limestones around Saintes between the Coniacian and Campanian divisions.
His large Senonian division concealed distinct rock and fossil successions along the Charente; local reference sections made the stages usable.
Marine fossils, especially oysters and echinoids, and mapped limestone–chalk units around Saintes justified the subdivision.
Today it is a globally recognised Late Cretaceous age whose formal boundary criteria do not depend on Coquand’s oysters at Saintes.
Editorial qualification
Coquand’s own 1858 explanation says he chose the town because the strata were well exposed and easy to verify nearby.
Related names
Cretaceous · Late Cretaceous · Coniacian · Campanian · Senonian
Sources
- International Commission on Stratigraphy, International Chronostratigraphic Chart v2026/06 — Controlling nomenclature, rank and sequence of internationally recognised ages; not a historical-coinage source
- Nouvelle-Aquitaine geological heritage inventory: Santonian and Coquand’s 1858 rationale — Quotes Coquand explaining the choice of Saintes and fossil-bearing strata
- British Geological Survey, Geological Conservation Review: Upper Cretaceous rocks of the British Isles — Scholarly history of d’Orbigny, Coquand, Senonian and Maastrichtian stages
- British Geological Survey, GCR Appendix: Upper Cretaceous stages and substages — Detailed historical type localities, faunal markers and changing stage conceptions