Hettangian stage

E333442

chronostratigraphic stage geologic age

The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (3)

Label	Occurrences
Hettangian	2
Hettangian Stage	2
Hettangian stage canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T3164913 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Hettangian stage
Context triple: [Hettange-Grande, givesNameTo, Hettangian stage]

A. Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
B. Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
C. Siderian Period
The Siderian Period is the earliest division of the Paleoproterozoic, marked by widespread banded iron formation deposition and the initial rise of atmospheric oxygen on Earth.
D. Ediacaran Period
The Ediacaran Period was a late Precambrian geological interval, roughly 635–541 million years ago, marked by the emergence of some of the earliest large, complex multicellular life forms.
E. Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Hettangian stage
Target entity description: The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.

A. Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
B. Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
C. Siderian Period
The Siderian Period is the earliest division of the Paleoproterozoic, marked by widespread banded iron formation deposition and the initial rise of atmospheric oxygen on Earth.
D. Ediacaran Period
The Ediacaran Period was a late Precambrian geological interval, roughly 635–541 million years ago, marked by the emergence of some of the earliest large, complex multicellular life forms.
E. Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	chronostratigraphic stage ⓘ geologic age ⓘ
associatedWith	post–Triassic–Jurassic extinction recovery ⓘ
belongsToEon	Phanerozoic Eon ⓘ surface form: Phanerozoic eon
belongsToEra	Mesozoic Era ⓘ surface form: Mesozoic era
chronology	International Chronostratigraphic Chart ⓘ surface form: International Commission on Stratigraphy timescale
commonFossils	ammonites ⓘ bivalves ⓘ marine reptiles ⓘ
earliestAgeOf	Jurassic Period ⓘ surface form: Jurassic period
environment	predominantly marine ⓘ
follows	Rhaetian Stage ⓘ surface form: Rhaetian stage Triassic period ⓘ
lithostratigraphicUsage	Lower Jurassic formations worldwide ⓘ
lowerBoundaryDefinedBy	firstAppearanceOfPsiloceras spelae group ⓘ firstAppearanceOfPsiloceras spelae tirolicum ⓘ
lowerGSSPCountry	Austria ⓘ
lowerGSSPLocation	Karwendel ⓘ surface form: Karwendel Mountains Kuhjoch section ⓘ
lowerGSSPYearRatified	2010 ⓘ
marks	Triassic–Jurassic extinction event ⓘ surface form: Triassic–Jurassic boundary
namedAfter	Hettange-Grande ⓘ Hettange-Grande, France ⓘ
partOf	Early Jurassic ⓘ surface form: Early Jurassic epoch Jurassic Period ⓘ surface form: Jurassic period Early Jurassic ⓘ surface form: Lower Jurassic series Mesozoic Era ⓘ surface form: Mesozoic era
precedes	Pliensbachian ⓘ surface form: Sinemurian stage
rank	age ⓘ stage ⓘ
standardAbbreviation	Het ⓘ
startOf	Early Jurassic epoch ⓘ Jurassic Period ⓘ surface form: Jurassic period Early Jurassic ⓘ surface form: Lower Jurassic series
system	Jurassic Period ⓘ surface form: Jurassic system
timeEndMa	199.3 ⓘ
timeEndUncertaintyMa	0.3 ⓘ
timeScaleColor	light blue (Jurassic standard color) ⓘ
timeStartMa	201.3 ⓘ
timeStartUncertaintyMa	0.2 ⓘ
upperBoundaryDefinedBy	firstAppearanceOfVermiceras domeykanum ⓘ firstAppearanceOfVermiceras quantoxense ⓘ
usedIn	geologic time scale ⓘ historical geology ⓘ paleontology ⓘ stratigraphy ⓘ

How these facts were elicited

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Hettange-Grande → givesNameTo → Hettangian stage ⓘ

Hettange-Grande → geologicalStageNamedAfter → Hettangian stage ⓘ

this entity surface form: Hettangian

Late Triassic → followedBy → Hettangian stage ⓘ

this entity surface form: Hettangian

Global Boundary Stratotype Section and Point for base of Hettangian → marksBaseOf → Hettangian stage ⓘ

this entity surface form: Hettangian Stage

Hettange-Grande Formation → chronostratigraphicUnit → Hettangian stage ⓘ