Hell Creek Formation
E73998
The Hell Creek Formation is a famous Late Cretaceous rock unit in North America renowned for its exceptionally rich dinosaur fossils, including iconic specimens like Tyrannosaurus rex and Triceratops.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Hell Creek Formation canonical | 16 |
| Hell Creek | 1 |
| Hell Creek Formation, Montana | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T593653 — 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: Hell Creek Formation Context triple: [SUE the T. rex, discoveredInFormation, Hell Creek Formation]
-
A.
Morrison Formation
The Morrison Formation is a vast Late Jurassic sedimentary rock formation in the western United States renowned for its exceptionally rich assemblage of dinosaur fossils, including iconic sauropods and theropods.
-
B.
Holston Formation
The Holston Formation is a geologic unit in eastern Tennessee renowned for its high-quality crystalline limestone commonly marketed as Tennessee marble and widely used in prominent architectural projects.
-
C.
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.
-
D.
Montrose Basin
Montrose Basin is a large tidal estuary and wildlife reserve on Scotland’s east coast, renowned for its rich birdlife and coastal habitats.
-
E.
Amadeus Basin geological region
The Amadeus Basin geological region is a vast sedimentary basin in central Australia known for its ancient rock formations and significant natural landmarks, including Uluru.
- 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: Hell Creek Formation Target entity description: The Hell Creek Formation is a famous Late Cretaceous rock unit in North America renowned for its exceptionally rich dinosaur fossils, including iconic specimens like Tyrannosaurus rex and Triceratops.
-
A.
Morrison Formation
The Morrison Formation is a vast Late Jurassic sedimentary rock formation in the western United States renowned for its exceptionally rich assemblage of dinosaur fossils, including iconic sauropods and theropods.
-
B.
Holston Formation
The Holston Formation is a geologic unit in eastern Tennessee renowned for its high-quality crystalline limestone commonly marketed as Tennessee marble and widely used in prominent architectural projects.
-
C.
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.
-
D.
Montrose Basin
Montrose Basin is a large tidal estuary and wildlife reserve on Scotland’s east coast, renowned for its rich birdlife and coastal habitats.
-
E.
Amadeus Basin geological region
The Amadeus Basin geological region is a vast sedimentary basin in central Australia known for its ancient rock formations and significant natural landmarks, including Uluru.
- F. None of above. chosen
Statements (77)
| Predicate | Object |
|---|---|
| instanceOf |
fossiliferous stratigraphic unit
ⓘ
geologic formation ⓘ sedimentary rock unit ⓘ |
| ageRange | approximately 66 to 68 million years ago ⓘ |
| associatedWith |
Chicxulub impact crater
ⓘ
surface form:
Chicxulub impact event
|
| contains |
Cretaceous–Paleogene boundary
ⓘ
surface form:
Cretaceous–Paleogene boundary layer
iridium anomaly near K–Pg boundary ⓘ paleosols ⓘ |
| containsFossil |
Acheroraptor temertyorum
ⓘ
Anzu wyliei ⓘ Champsosaurus ⓘ Crocodyliformes ⓘ Dakotaraptor steini ⓘ Denversaurus ⓘ Edmontosaurus annectens ⓘ Leptoceratops gracilis ⓘ Nodosauridae ⓘ Ornithomimus ⓘ Pachycephalosaurus wyomingensis ⓘ Ornithomimus ⓘ
surface form:
Struthiomimus
Thescelosaurus neglectus ⓘ Triceratops ⓘ
surface form:
Torosaurus latus
Triceratops ⓘ
surface form:
Triceratops horridus
Triceratops ⓘ
surface form:
Triceratops prorsus
Tyrannosaurus ⓘ
surface form:
Tyrannosaurus rex
amphibians ⓘ angiosperm leaves ⓘ conifer wood ⓘ early placental mammals ⓘ ferns ⓘ freshwater turtles ⓘ insects ⓘ mammals ⓘ marsupials ⓘ multituberculates ⓘ pollen ⓘ rays ⓘ sharks ⓘ spores ⓘ teleost fishes ⓘ trace fossils ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| depositionalEnvironment |
deltaic
ⓘ
floodplain ⓘ fluvial ⓘ |
| geologicAge | Maastrichtian ⓘ |
| geologicPeriod | Late Cretaceous ⓘ |
| hasResearchSite |
Badlands
ⓘ
surface form:
Badlands of North Dakota
Fort Peck area ⓘ Makoshika State Park ⓘ |
| isTypeLocalityFor |
Acheroraptor temertyorum
ⓘ
Anzu wyliei ⓘ Dakotaraptor steini ⓘ Triceratops ⓘ
surface form:
Triceratops horridus
Tyrannosaurus ⓘ
surface form:
Tyrannosaurus rex
|
| lithology |
coal
ⓘ
mudstone ⓘ sandstone ⓘ shale ⓘ siltstone ⓘ |
| locatedIn |
Montana
ⓘ
North Dakota ⓘ South Dakota ⓘ Wyoming ⓘ |
| namedAfter |
Hell Creek Formation
self-linksurface differs
ⓘ
surface form:
Hell Creek
|
| namedBy | Barnum Brown ⓘ |
| namingYear | 1907 ⓘ |
| notableFor |
Cretaceous–Paleogene boundary studies
ⓘ
rich dinosaur fauna ⓘ |
| overlies |
Fox Hills Formation
ⓘ
Pierre Shale ⓘ |
| paleoclimate |
humid
ⓘ
warm temperate ⓘ |
| paleogeography | coastal plain of Western Interior Seaway ⓘ |
| partOf | Western Interior Basin ⓘ |
| region | Great Plains ⓘ |
| underlies | Fort Union 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: Hell Creek Formation Description of subject: The Hell Creek Formation is a famous Late Cretaceous rock unit in North America renowned for its exceptionally rich dinosaur fossils, including iconic specimens like Tyrannosaurus rex and Triceratops.
Referenced by (18)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Hell Creek
this entity surface form:
Hell Creek Formation, Montana