Meishan section China for base of Triassic
E200225
The Meishan section in China is a globally significant stratigraphic site that marks the internationally agreed boundary and reference point for the beginning of the Triassic Period.
All labels observed (2)
| Label | Occurrences |
|---|---|
| GSSP at Meishan, Zhejiang, China (base of Triassic) | 1 |
| Meishan section China for base of Triassic canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1772753 — 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: Meishan section China for base of Triassic Context triple: [Triassic, GSSP, Meishan section China for base of Triassic]
-
A.
Sichuan Basin
The Sichuan Basin is a large, fertile lowland region in southwestern China, surrounded by mountains and known as a major agricultural and population center.
-
B.
middle reaches of the Yangtze River
The middle reaches of the Yangtze River are a broad, fertile section of central China’s Yangtze basin characterized by extensive plains, major lakes, and dense agricultural and urban development.
-
C.
Southwest China
Southwest China is a broad geographic and cultural region of China known for its mountainous terrain, ethnic diversity, and major provinces such as Sichuan, Yunnan, Guizhou, and the Tibet Autonomous Region.
-
D.
Yangtze Plate
The Yangtze Plate is a major tectonic block underlying much of central and eastern China, playing a key role in the region’s geological structure and seismic activity.
-
E.
Three Gorges Reservoir Region
The Three Gorges Reservoir Region is a vast, ecologically and culturally significant area in central China surrounding the Three Gorges Dam along the Yangtze River, known for its dramatic landscapes, biodiversity, and large-scale resettlement and conservation efforts.
- 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: Meishan section China for base of Triassic Target entity description: The Meishan section in China is a globally significant stratigraphic site that marks the internationally agreed boundary and reference point for the beginning of the Triassic Period.
-
A.
Sichuan Basin
The Sichuan Basin is a large, fertile lowland region in southwestern China, surrounded by mountains and known as a major agricultural and population center.
-
B.
middle reaches of the Yangtze River
The middle reaches of the Yangtze River are a broad, fertile section of central China’s Yangtze basin characterized by extensive plains, major lakes, and dense agricultural and urban development.
-
C.
Southwest China
Southwest China is a broad geographic and cultural region of China known for its mountainous terrain, ethnic diversity, and major provinces such as Sichuan, Yunnan, Guizhou, and the Tibet Autonomous Region.
-
D.
Yangtze Plate
The Yangtze Plate is a major tectonic block underlying much of central and eastern China, playing a key role in the region’s geological structure and seismic activity.
-
E.
Three Gorges Reservoir Region
The Three Gorges Reservoir Region is a vast, ecologically and culturally significant area in central China surrounding the Three Gorges Dam along the Yangtze River, known for its dramatic landscapes, biodiversity, and large-scale resettlement and conservation efforts.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Global Boundary Stratotype Section and Point
ⓘ
geological type section ⓘ stratigraphic section ⓘ |
| boundaryDefinedBy | first appearance datum of the conodont Hindeodus parvus ⓘ |
| contains |
Permian–Triassic mass extinction horizon
ⓘ
ammonoid fossil assemblages ⓘ conodont fossil assemblages ⓘ foraminiferal fossil assemblages ⓘ |
| country | China ⓘ |
| geologicalAgeMarked | approximately 252 million years ago ⓘ |
| governingBody |
subcommission on Permian stratigraphy
ⓘ
surface form:
Subcommission on Permian Stratigraphy
Subcommission on Triassic Stratigraphy ⓘ |
| hasChemostratigraphy |
carbon isotope excursions across the Permian–Triassic boundary
ⓘ
strontium isotope data ⓘ sulfur isotope data ⓘ |
| hasEventRecorded | largest known Phanerozoic mass extinction ⓘ |
| isGSSPFor |
base of the Induan Stage
ⓘ
base of the Lower Triassic Series ⓘ base of the Triassic System ⓘ |
| lithology |
marine carbonate rocks
ⓘ
marls ⓘ thin-bedded limestones ⓘ |
| locatedIn |
Changxing County
ⓘ
Zhejiang Province ⓘ |
| locatedOn | South China Block ⓘ |
| marks |
Permian–Triassic mass extinction
ⓘ
surface form:
Permian–Triassic boundary
base of the Triassic Period ⓘ |
| near | city of Changxing ⓘ |
| overlies | Upper Permian strata ⓘ |
| partOf | global network of GSSP sections ⓘ |
| preservationQuality | excellent ⓘ |
| ratificationYear | 2001 ⓘ |
| ratifiedBy |
International Commission on Stratigraphy
ⓘ
International Union of Geological Sciences ⓘ |
| recognizedAs |
Global Boundary Stratotype Section and Point
ⓘ
surface form:
international stratotype for the Permian–Triassic boundary
|
| region | eastern China ⓘ |
| significance |
global reference point for the base of the Triassic
ⓘ
key record of the end-Permian mass extinction ⓘ |
| stratigraphicCompleteness | high ⓘ |
| studiedBy |
geochemists
ⓘ
paleontologists ⓘ stratigraphers ⓘ |
| timeScaleUnit | boundary between the Paleozoic and Mesozoic eras ⓘ |
| underlies | Lower Triassic strata ⓘ |
| usedFor |
calibration of the geologic time scale
ⓘ
global chronostratigraphic correlation ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Meishan section China for base of Triassic Description of subject: The Meishan section in China is a globally significant stratigraphic site that marks the internationally agreed boundary and reference point for the beginning of the Triassic Period.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
GSSP at Meishan, Zhejiang, China (base of Triassic)