Lance Formation
E920373
Lance Formation is a Late Cretaceous geological formation in North America renowned for its rich dinosaur fossil beds, including specimens of Triceratops.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Lance Formation canonical | 9 |
| Lance Formation sandstones | 1 |
| Lance Formation, Wyoming | 1 |
| Upper Cretaceous Lance Formation | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11339359 — 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: Lance Formation Context triple: [Triceratops, fossilFoundIn, Lance Formation]
-
A.
Curtis Formation
The Curtis Formation is a Middle Jurassic geologic unit in the western United States, characterized mainly by marine sandstones and siltstones that record shallow sea environments.
-
B.
Carmel Formation
The Carmel Formation is a Middle Jurassic geologic unit of the western United States, characterized by marine and marginal-marine sediments that record a transition from desert dune environments to shallow seas.
-
C.
Yeso Formation
The Yeso Formation is a geologic unit of early Permian age in the southwestern United States, notable for its thick sequences of evaporites and sandstones that record arid, shallow-marine and coastal depositional environments within the Permian Basin region.
-
D.
Los Rastros Formation
Los Rastros Formation is a Late Triassic geological formation in northwestern Argentina known for its fossil-rich sedimentary rocks that record ancient lake and river environments.
-
E.
Etchegoin Formation
The Etchegoin Formation is a geologic unit in California’s San Joaquin Basin known for its significant petroleum reservoirs, particularly in major fields such as the Belridge Oil Field.
- 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: Lance Formation Target entity description: Lance Formation is a Late Cretaceous geological formation in North America renowned for its rich dinosaur fossil beds, including specimens of Triceratops.
-
A.
Curtis Formation
The Curtis Formation is a Middle Jurassic geologic unit in the western United States, characterized mainly by marine sandstones and siltstones that record shallow sea environments.
-
B.
Carmel Formation
The Carmel Formation is a Middle Jurassic geologic unit of the western United States, characterized by marine and marginal-marine sediments that record a transition from desert dune environments to shallow seas.
-
C.
Yeso Formation
The Yeso Formation is a geologic unit of early Permian age in the southwestern United States, notable for its thick sequences of evaporites and sandstones that record arid, shallow-marine and coastal depositional environments within the Permian Basin region.
-
D.
Los Rastros Formation
Los Rastros Formation is a Late Triassic geological formation in northwestern Argentina known for its fossil-rich sedimentary rocks that record ancient lake and river environments.
-
E.
Etchegoin Formation
The Etchegoin Formation is a geologic unit in California’s San Joaquin Basin known for its significant petroleum reservoirs, particularly in major fields such as the Belridge Oil Field.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
geological formation
ⓘ
sedimentary rock formation ⓘ |
| age | Maastrichtian ⓘ |
| contains | vertebrate microfossil sites ⓘ |
| containsFossilsOf |
Ankylosauria
ⓘ
linked to:
Ankylosauridae
Ceratopsia ⓘ Crocodyliformes ⓘ Edmontosaurus ⓘ
linked to:
Edmontosaurus annectens
Hadrosauridae ⓘ Pachycephalosauria ⓘ
linked to:
Pachycephalosauridae
Triceratops ⓘ Tyrannosaurus rex ⓘ
linked to:
Tyrannosaurus
amphibians ⓘ birds ⓘ ceratopsid dinosaurs ⓘ dromaeosaurids ⓘ fish ⓘ mammals ⓘ ornithomimids ⓘ sauropod remains (rare) ⓘ theropod dinosaurs ⓘ troodontids ⓘ turtles ⓘ |
| continent | North America ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalEnvironment |
deltaic
ⓘ
fluvial ⓘ |
| geologicalPeriod | Late Cretaceous ⓘ |
| hasStratigraphicRank | formation ⓘ |
| knownFor |
abundant Triceratops fossils
ⓘ
rich dinosaur fossil beds ⓘ |
| lithology |
mudstone
ⓘ
sandstone ⓘ shale ⓘ siltstone ⓘ |
| locatedIn |
Montana
ⓘ
North America ⓘ South Dakota ⓘ United States ⓘ
linked to:
United States of America
Wyoming ⓘ |
| namedAfter | Lance Creek, Wyoming ⓘ |
| overlies | Fox Hills Formation ⓘ |
| partOf |
Western Interior of North America
ⓘ
linked to:
Western Interior Basin
|
| region | Great Plains ⓘ |
| similarTo | Hell Creek Formation ⓘ |
| stratigraphicUnitOf | Western Interior Seaway margin ⓘ |
| temporalRelation | among last dinosaur-bearing formations before Cretaceous–Paleogene extinction event ⓘ |
| 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: Lance Formation Description of subject: Lance Formation is a Late Cretaceous geological formation in North America renowned for its rich dinosaur fossil beds, including specimens of Triceratops.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Lance Formation
linked to: Lance Formation
linked to: Lance Formation