Yixian Formation
E724085
The Yixian Formation is an Early Cretaceous geological formation in northeastern China renowned for its exceptionally well-preserved fossils, including early mammals, feathered dinosaurs, and primitive birds.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Jehol Biota | 2 |
| Yixian Formation canonical | 2 |
| Jehol Biota fossil localities | 1 |
| Jehol Group | 1 |
| Lufeng Basin | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8255902 — 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: Yixian Formation Context triple: [Eomaia, fossilSite, Yixian Formation]
-
A.
Tiaojishan Formation
The Tiaojishan Formation is a Middle to Late Jurassic geological formation in northeastern China renowned for its exceptionally well-preserved fossils, including early mammals, dinosaurs, and other vertebrates.
-
B.
Djadokhta Formation
The Djadokhta Formation is a Late Cretaceous sedimentary rock unit in Mongolia renowned for its exceptionally well-preserved dinosaur fossils, including iconic theropods and other desert-adapted fauna.
-
C.
Barun Goyot Formation
The Barun Goyot Formation is a Late Cretaceous sedimentary rock formation in Mongolia renowned for its rich fossil beds, including remains of the dinosaur Velociraptor.
-
D.
Areyonga Formation
The Areyonga Formation is a geological rock unit within central Australia's Amadeus Basin, known for its sedimentary sequences that record Proterozoic environmental and tectonic history.
-
E.
Kaiparowits Formation
The Kaiparowits Formation is a Late Cretaceous rock unit in southern Utah renowned for its exceptionally rich and diverse dinosaur and vertebrate fossil assemblages.
- 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: Yixian Formation Target entity description: The Yixian Formation is an Early Cretaceous geological formation in northeastern China renowned for its exceptionally well-preserved fossils, including early mammals, feathered dinosaurs, and primitive birds.
-
A.
Tiaojishan Formation
The Tiaojishan Formation is a Middle to Late Jurassic geological formation in northeastern China renowned for its exceptionally well-preserved fossils, including early mammals, dinosaurs, and other vertebrates.
-
B.
Djadokhta Formation
The Djadokhta Formation is a Late Cretaceous sedimentary rock unit in Mongolia renowned for its exceptionally well-preserved dinosaur fossils, including iconic theropods and other desert-adapted fauna.
-
C.
Barun Goyot Formation
The Barun Goyot Formation is a Late Cretaceous sedimentary rock formation in Mongolia renowned for its rich fossil beds, including remains of the dinosaur Velociraptor.
-
D.
Areyonga Formation
The Areyonga Formation is a geological rock unit within central Australia's Amadeus Basin, known for its sedimentary sequences that record Proterozoic environmental and tectonic history.
-
E.
Kaiparowits Formation
The Kaiparowits Formation is a Late Cretaceous rock unit in southern Utah renowned for its exceptionally rich and diverse dinosaur and vertebrate fossil assemblages.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
fossil-bearing stratigraphic unit
ⓘ
geological formation ⓘ |
| age |
Aptian
ⓘ
Barremian ⓘ |
| containsFossil |
Caudipteryx
ⓘ
Confuciusornis ⓘ Eomaia ⓘ Ephedra ⓘ Ginkgoites ⓘ Jeholornis ⓘ Liaoningosaurus ⓘ Lycoptera ⓘ Microraptor ⓘ Psittacosaurus ⓘ Repenomamus ⓘ Sinornithosaurus ⓘ Sinosauropteryx ⓘ Yixianosaurus ⓘ
linked to:
Xiaotingia
fossil amphibians ⓘ fossil fishes ⓘ fossil insects ⓘ fossil pterosaurs ⓘ fossil turtles ⓘ |
| containsMember |
Jianshangou Bed
ⓘ
Lujiatun Bed ⓘ |
| country | China ⓘ |
| depositionalEnvironment |
lacustrine
ⓘ
volcaniclastic ⓘ |
| discoveredIn | 20th century ⓘ |
| geologicalPeriod | Early Cretaceous ⓘ |
| knownFor |
Jehol Biota
ⓘ
linked to:
Yixian Formation
early mammal fossils ⓘ exceptional fossil preservation ⓘ feathered dinosaur fossils ⓘ primitive bird fossils ⓘ |
| lithology |
andesite
ⓘ
basalt ⓘ mudstone ⓘ sandstone ⓘ tuff ⓘ |
| locatedIn |
Hebei Province
ⓘ
linked to:
Hebei
Inner Mongolia ⓘ
linked to:
Inner Mongolia Autonomous Region
Liaoning Province ⓘ
linked to:
Liaoning
northeastern China ⓘ |
| notableSite |
Beipiao area
ⓘ
linked to:
Beipiao
Sihetun locality ⓘ |
| overlies | Tuchengzi Formation ⓘ |
| paleoclimate |
seasonal
ⓘ
temperate ⓘ |
| partOf |
Jehol Group
ⓘ
linked to:
Yixian Formation
|
| stratigraphicUnitOf |
Jehol Biota
ⓘ
linked to:
Yixian Formation
|
| underlies | Jiufotang Formation ⓘ |
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: Yixian Formation Description of subject: The Yixian Formation is an Early Cretaceous geological formation in northeastern China renowned for its exceptionally well-preserved fossils, including early mammals, feathered dinosaurs, and primitive birds.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Yixian Formation
linked to: Yixian Formation
linked to: Yixian Formation
linked to: Yixian Formation
linked to: Yixian Formation