Fort Union Formation
E364207
The Fort Union Formation is a widespread Paleocene sedimentary rock unit in the northern Great Plains of the United States, known for its coal beds and important fossil flora and fauna that record early Cenozoic terrestrial environments.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Fort Union Formation canonical | 4 |
| Fort Union Group | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3502380 — 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: Fort Union Formation Context triple: [Hell Creek Formation, underlies, Fort Union Formation]
-
A.
Sundance Formation
The Sundance Formation is a Middle to Late Jurassic marine sedimentary rock unit in the western United States, known for its shallow sea deposits that underlie the dinosaur-rich Morrison Formation.
-
B.
Dakota Formation
The Dakota Formation is a widespread Cretaceous sedimentary rock unit in North America, noted for its sandstone deposits that record the advance of the Western Interior Seaway and preserve abundant plant and dinosaur fossils.
-
C.
Kayenta Formation
The Kayenta Formation is an Early Jurassic sandstone and siltstone rock unit on the Colorado Plateau, renowned for its distinctive red cliffs and important dinosaur fossil trackways.
-
D.
Claron Formation
The Claron Formation is a geologic rock unit of colorful limestones and mudstones best known for forming the striking hoodoos and cliffs of Bryce Canyon and other parts of the Paunsaugunt Plateau in southern Utah.
-
E.
Chinle Formation
The Chinle Formation is a Late Triassic geologic formation in the southwestern United States, renowned for its colorful badlands, rich fossil beds, and extensive petrified wood deposits.
- 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: Fort Union Formation Target entity description: The Fort Union Formation is a widespread Paleocene sedimentary rock unit in the northern Great Plains of the United States, known for its coal beds and important fossil flora and fauna that record early Cenozoic terrestrial environments.
-
A.
Sundance Formation
The Sundance Formation is a Middle to Late Jurassic marine sedimentary rock unit in the western United States, known for its shallow sea deposits that underlie the dinosaur-rich Morrison Formation.
-
B.
Dakota Formation
The Dakota Formation is a widespread Cretaceous sedimentary rock unit in North America, noted for its sandstone deposits that record the advance of the Western Interior Seaway and preserve abundant plant and dinosaur fossils.
-
C.
Kayenta Formation
The Kayenta Formation is an Early Jurassic sandstone and siltstone rock unit on the Colorado Plateau, renowned for its distinctive red cliffs and important dinosaur fossil trackways.
-
D.
Claron Formation
The Claron Formation is a geologic rock unit of colorful limestones and mudstones best known for forming the striking hoodoos and cliffs of Bryce Canyon and other parts of the Paunsaugunt Plateau in southern Utah.
-
E.
Chinle Formation
The Chinle Formation is a Late Triassic geologic formation in the southwestern United States, renowned for its colorful badlands, rich fossil beds, and extensive petrified wood deposits.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
sedimentary rock unit ⓘ |
| age |
early Paleocene
ⓘ
late Paleocene ⓘ middle Paleocene ⓘ |
| belongsTo |
Fort Union Group
ⓘ
linked to:
Fort Union Formation
|
| color |
brown
ⓘ
gray ⓘ |
| contains |
channel sand bodies
ⓘ
coal beds ⓘ floodplain mudstones ⓘ paleosols ⓘ |
| containsFossilsOf |
freshwater mollusks
ⓘ
mammals ⓘ plants ⓘ reptiles ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalEnvironment |
fluvial
ⓘ
lacustrine ⓘ paludal ⓘ |
| economicImportance |
coal resource
ⓘ
hydrocarbon source rock ⓘ |
| exposedIn |
Colorado
ⓘ
Montana ⓘ North Dakota ⓘ South Dakota ⓘ Wyoming ⓘ |
| geologicPeriod | Paleocene ⓘ |
| geologicTimeScale | Cenozoic ⓘ |
| knownFor |
fossil fauna
ⓘ
fossil flora ⓘ thick coal seams ⓘ |
| lithology |
carbonaceous shale
ⓘ
coal ⓘ sandstone ⓘ shale ⓘ siltstone ⓘ |
| locatedIn | northern Great Plains ⓘ |
| namedFor | Fort Union ⓘ |
| overlies | Hell Creek Formation ⓘ |
| paleoclimateEvidence |
humid conditions
ⓘ
warm temperate conditions ⓘ |
| partOf | Williston Basin ⓘ |
| records | early Cenozoic terrestrial environments ⓘ |
| stratigraphicUnitOf |
Western Interior of North America
ⓘ
linked to:
Western North America
|
| underlies | Wasatch 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: Fort Union Formation Description of subject: The Fort Union Formation is a widespread Paleocene sedimentary rock unit in the northern Great Plains of the United States, known for its coal beds and important fossil flora and fauna that record early Cenozoic terrestrial environments.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Fort Union Formation