Maastrichtian
Last Cretaceous age, named for the Maastricht fossil limestones but formally based elsewhere today.
Language and route: French geological usage from Dutch toponym. Dutch place-name Maastricht → Dumont’s French système maestrichtien (1849) → international Maastrichtian.
Literal gloss: ‘of/from Maastricht’ (geographical; not a Greek compound)
The name and its history
André Hubert Dumont · 1849 (original *système maestrichtien*)
- What does the word literally mean?
- ‘of/from Maastricht’ (geographical; not a Greek compound)
- What did the original author mean?
- Dumont separated fossil-rich friable and glauconitic limestone deposits around the Sint Pietersberg near Maastricht from earlier chalk units.
- Why was the name needed?
- Regional chalk classifications struggled to place these distinctive younger fossil assemblages and carbonate facies in the wider northern European succession.
- What evidence supported the original concept?
- Local quarry sections and well-known marine fossils supplied the rock-unit concept; the Maastricht section proved incomplete around the later-defined base.
- How has geology changed the concept?
- The final Cretaceous age now begins at the Tercis-les-Bains GSSP in France and ends at the global Cretaceous–Paleogene extinction boundary; it is not defined by a Maastricht quarry.
Further historical context
Dumont separated fossil-rich friable and glauconitic limestone deposits around the Sint Pietersberg near Maastricht from earlier chalk units.
Regional chalk classifications struggled to place these distinctive younger fossil assemblages and carbonate facies in the wider northern European succession.
Local quarry sections and well-known marine fossils supplied the rock-unit concept; the Maastricht section proved incomplete around the later-defined base.
The final Cretaceous age now begins at the Tercis-les-Bains GSSP in France and ends at the global Cretaceous–Paleogene extinction boundary; it is not defined by a Maastricht quarry.
Editorial qualification
His manuscript notes from 1850 revised his original idea, but unpublished notes should not replace the published 1849 concept.
Related names
Cretaceous · Late Cretaceous · Campanian · Paleocene · Fossil
Sources
- International Commission on Stratigraphy, International Chronostratigraphic Chart v2026/06 — Controlling nomenclature, rank and sequence of internationally recognised ages; not a historical-coinage source
- Dutch national stratigraphic nomenclature, Maastricht Formation — Dumont 1849 and original Système Maestrichtien, type area
- Jagt & Jagt-Yazykova (2012), Stratigraphy of the type Maastrichtian — Explains Dumont’s 1849 wording, 1850 manuscript modification and revised type extent
- ICS Cretaceous Subcommission, Maastrichtian GSSP at Tercis-les-Bains — Modern defining boundary is in France, not Netherlands
- British Geological Survey, GCR Appendix: Upper Cretaceous stages and substages — Detailed historical type localities, faunal markers and changing stage conceptions