Global Boundary Stratotype Section and Point for base of Hettangian

E196701

Global Boundary Stratotype Section and Point chronostratigraphic reference point geological boundary stratotype

The Global Boundary Stratotype Section and Point for the base of the Hettangian is the internationally agreed geological reference point that marks the formal beginning of the Jurassic Period and the Mesozoic era’s post-Triassic recovery interval.

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All labels observed (3)

Label	Occurrences
GSSP for base of Hettangian	1
Global Boundary Stratotype Section and Point for base of Hettangian canonical	1
Triassic–Jurassic boundary GSSP	1

How this entity was disambiguated

This entity first appeared as the object of triple T1758891 — 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: Global Boundary Stratotype Section and Point for base of Hettangian
Context triple: [Early Jurassic, stratotypeDefinedBy, Global Boundary Stratotype Section and Point for base of Hettangian]

A. Global Boundary Stratotype Section and Point at Klonk, Czech Republic
The Global Boundary Stratotype Section and Point at Klonk in the Czech Republic is a formally designated geological reference site that marks the internationally agreed base of the Devonian System and serves as a key standard for correlating Early Devonian rock strata worldwide.
B. International Chronostratigraphic Chart
The International Chronostratigraphic Chart is the globally recognized standard timeline used by geologists to define and correlate the divisions of Earth’s geological history.
C. Siccar Point unconformity
The Siccar Point unconformity is a famous geological site in Scotland where dramatically tilted older rocks are overlain by younger strata, providing key evidence for deep geological time and helping to establish modern geology.
D. Solnhofen Limestone
Solnhofen Limestone is a famous Late Jurassic lithographic limestone formation in Bavaria, Germany, renowned for its exceptionally well-preserved fossils, including the iconic Archaeopteryx.
E. Rhynie Chert fossil locality
The Rhynie Chert fossil locality is a famous Early Devonian site in Scotland renowned for its exceptionally preserved early land plants, arthropods, and microorganisms that provide key insights into the evolution of terrestrial ecosystems.
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: Global Boundary Stratotype Section and Point for base of Hettangian
Target entity description: The Global Boundary Stratotype Section and Point for the base of the Hettangian is the internationally agreed geological reference point that marks the formal beginning of the Jurassic Period and the Mesozoic era’s post-Triassic recovery interval.

A. Global Boundary Stratotype Section and Point at Klonk, Czech Republic
The Global Boundary Stratotype Section and Point at Klonk in the Czech Republic is a formally designated geological reference site that marks the internationally agreed base of the Devonian System and serves as a key standard for correlating Early Devonian rock strata worldwide.
B. International Chronostratigraphic Chart
The International Chronostratigraphic Chart is the globally recognized standard timeline used by geologists to define and correlate the divisions of Earth’s geological history.
C. Siccar Point unconformity
The Siccar Point unconformity is a famous geological site in Scotland where dramatically tilted older rocks are overlain by younger strata, providing key evidence for deep geological time and helping to establish modern geology.
D. Solnhofen Limestone
Solnhofen Limestone is a famous Late Jurassic lithographic limestone formation in Bavaria, Germany, renowned for its exceptionally well-preserved fossils, including the iconic Archaeopteryx.
E. Rhynie Chert fossil locality
The Rhynie Chert fossil locality is a famous Early Devonian site in Scotland renowned for its exceptionally preserved early land plants, arthropods, and microorganisms that provide key insights into the evolution of terrestrial ecosystems.
F. None of above. chosen

Statements (37)

Predicate	Object
instanceOf	Global Boundary Stratotype Section and Point ⓘ chronostratigraphic reference point ⓘ geological boundary stratotype ⓘ
appliesTo	Mesozoic Era ⓘ
approvedBy	International Union of Geological Sciences ⓘ
belongsToDiscipline	geology ⓘ stratigraphy ⓘ
definedBy	International Commission on Stratigraphy ⓘ
definesBoundaryBetween	Jurassic Period ⓘ surface form: Jurassic System Triassic ⓘ surface form: Triassic System
definesBoundaryType	chronostratigraphic boundary ⓘ
follows	Late Triassic ⓘ Rhaetian Stage ⓘ
hasAbbreviation	Global Boundary Stratotype Section and Point for base of Hettangian self-linksurface differs ⓘ surface form: GSSP for base of Hettangian
hasGlobalStatus	ratified international standard ⓘ
hasRank	stage boundary ⓘ
hasStratigraphicLevel	series boundary ⓘ stage boundary ⓘ system boundary ⓘ
hasTemporalContext	post-mass-extinction recovery after end-Triassic extinction ⓘ
hasTemporalPosition	earliest Jurassic ⓘ
isGlobalStandardFor	Triassic–Jurassic extinction event ⓘ surface form: Triassic–Jurassic boundary base of Hettangian Stage ⓘ base of Jurassic System ⓘ
isPartOf	International Chronostratigraphic Chart ⓘ surface form: International Stratigraphic Chart
isReferenceFor	chemostratigraphic studies of Triassic–Jurassic transition ⓘ paleontological zonation across Triassic–Jurassic boundary ⓘ sedimentological studies of Triassic–Jurassic transition ⓘ
marksBaseOf	Hettangian stage ⓘ surface form: Hettangian Stage Jurassic Period ⓘ Jurassic Period ⓘ surface form: Jurassic System Early Jurassic ⓘ surface form: Lower Jurassic Series post-Triassic recovery interval of the Mesozoic Era ⓘ
precedes	Pliensbachian ⓘ surface form: Sinemurian Stage
usedFor	geological time scale calibration ⓘ global chronostratigraphic correlation ⓘ intercontinental stratigraphic correlation ⓘ

How these facts were elicited

Referenced by (3)

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

Early Jurassic → stratotypeDefinedBy → Global Boundary Stratotype Section and Point for base of Hettangian ⓘ

Global Boundary Stratotype Section and Point for base of Hettangian → hasAbbreviation → Global Boundary Stratotype Section and Point for base of Hettangian self-linksurface differs ⓘ

this entity surface form: GSSP for base of Hettangian

Triassic–Jurassic extinction event → stratigraphicMarker → Global Boundary Stratotype Section and Point for base of Hettangian ⓘ

this entity surface form: Triassic–Jurassic boundary GSSP

All labels observed (3)

How this entity was disambiguated Show

Statements (37)

How these facts were elicited Show

Referenced by (3)

How this entity was disambiguated

How these facts were elicited