Global Boundary Stratotype Section and Point

E364216

geologic time scale reference stratigraphic boundary marker

The Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed reference point in a specific rock sequence that precisely defines the lower boundary of a stage or age in the geologic time scale.

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

All labels observed (11)

Label	Occurrences
Global Boundary Stratotype Section and Point canonical	5
English term "Global Boundary Stratotype Section and Point"	1
GSSP for the base of the Cambrian	1
Global Boundary Stratotype Section and Point (GSSP)	1
Global Boundary Stratotype Section and Point (GSSP) used for stage limits	1
Global Boundary Stratotype Section and Point for the Langhian Stage	1
Global Boundary Stratotype Section and Point for the Serravallian Stage	1
Global Standard Stratigraphic Age boundary	1
Neogene GSSP network	1
Wuliu-Zengjiayan Global Boundary Stratotype Section and Point	1
international stratotype for the Permian–Triassic boundary	1

How this entity was disambiguated

This entity first appeared as the object of triple T3502463 — 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
Context triple: [Maastrichtian, definedBy, Global Boundary Stratotype Section and Point]

A. Global Boundary Stratotype Section and Point for base of Hettangian
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.
B. 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.
C. 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.
D. International Commission on Stratigraphy
The International Commission on Stratigraphy is the global scientific authority responsible for defining and standardizing the geological time scale and stratigraphic units used in Earth sciences.
E. Lomagundi–Jatuli carbon isotope excursion
The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
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
Target entity description: The Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed reference point in a specific rock sequence that precisely defines the lower boundary of a stage or age in the geologic time scale.

A. Global Boundary Stratotype Section and Point for base of Hettangian
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.
B. 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.
C. 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.
D. International Commission on Stratigraphy
The International Commission on Stratigraphy is the global scientific authority responsible for defining and standardizing the geological time scale and stratigraphic units used in Earth sciences.
E. Lomagundi–Jatuli carbon isotope excursion
The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	geologic time scale reference ⓘ stratigraphic boundary marker ⓘ
abbreviation	GSSP ⓘ
appliesTo	chronostratigraphic units ⓘ geochronologic units ⓘ
approvedBy	International Commission on Stratigraphy ⓘ
criterion	documented stratigraphic thickness across boundary ⓘ formal ratification procedure ⓘ long-term accessibility of the section ⓘ precise geographic coordinates ⓘ presence of primary marker (often fossil event) ⓘ presence of secondary markers (e.g., geochemical, magnetostratigraphic) ⓘ
defines	lower boundary of a stage ⓘ lower boundary of an age ⓘ
hasComponent	specific rock sequence ⓘ
hasExample	GSSP for the base of the Cambrian ⓘ linked to: Global Boundary Stratotype Section and Point GSSP for the base of the Devonian ⓘ GSSP for the base of the Holocene ⓘ GSSP for the base of the Jurassic ⓘ GSSP for the base of the Ordovician ⓘ
hasProperty	absence of major unconformities at boundary ⓘ continuous sedimentation across boundary ⓘ correlatable globally ⓘ good fossil content for biostratigraphy ⓘ internationally agreed ⓘ permanent marker in the field ⓘ physically accessible outcrop ⓘ precise radiometric dating desirable ⓘ precisely located reference point ⓘ protected stratigraphic section ⓘ well-exposed stratigraphic section ⓘ
introducedFor	standardization of stage boundaries worldwide ⓘ
language	English term "Global Boundary Stratotype Section and Point" ⓘ linked to: Global Boundary Stratotype Section and Point
partOf	International Stratigraphic Chart ⓘ linked to: International Chronostratigraphic Chart global standard stratigraphic age system ⓘ
regulatedBy	International Commission on Stratigraphy ⓘ
relatedConcept	Global Standard Stratigraphic Age ⓘ linked to: Global Standard Stratigraphic Age (GSSA) biostratigraphy ⓘ chemostratigraphy ⓘ chronostratigraphy ⓘ magnetostratigraphy ⓘ
standardizedBy	International Union of Geological Sciences ⓘ
timeSpan	Phanerozoic Eon focus ⓘ
usedFor	calibration of geologic time scale ⓘ defining boundaries of geologic ages ⓘ defining boundaries of geologic stages ⓘ global correlation of rock units ⓘ
usedIn	geologic time scale ⓘ

How these facts were elicited

Referenced by (15)

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

Maastrichtian → definedBy → Global Boundary Stratotype Section and Point ⓘ

International Commission on Stratigraphy → usesConcept → Global Boundary Stratotype Section and Point (GSSP) ⓘ

subject linked to: ICS