Morrison Formation
E52675
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.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Morrison Formation canonical | 29 |
| Brushy Basin Member of the Morrison Formation | 1 |
| Morrison Formation dinosaur-bearing beds | 1 |
| Morrison Formation, western United States | 1 |
| Upper Morrison Formation | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T415646 — 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: Morrison Formation Context triple: [Jurassic Period, hasNotableFossilSite, Morrison Formation]
-
A.
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.
-
B.
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.
-
C.
Ogallala Aquifer
The Ogallala Aquifer is one of the world’s largest underground freshwater reservoirs, supplying crucial irrigation and drinking water across much of the central United States.
-
D.
Mono Basin
Mono Basin is a high-desert watershed in eastern California best known for Mono Lake, its striking tufa formations, and its dramatic Eastern Sierra scenery.
-
E.
Great Plains
The Great Plains is a vast, mostly flat grassland region in central North America known for its prairies, agriculture, and continental climate.
- 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: Morrison Formation Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
Ogallala Aquifer
The Ogallala Aquifer is one of the world’s largest underground freshwater reservoirs, supplying crucial irrigation and drinking water across much of the central United States.
-
D.
Mono Basin
Mono Basin is a high-desert watershed in eastern California best known for Mono Lake, its striking tufa formations, and its dramatic Eastern Sierra scenery.
-
E.
Great Plains
The Great Plains is a vast, mostly flat grassland region in central North America known for its prairies, agriculture, and continental climate.
- F. None of above. chosen
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
sedimentary rock formation ⓘ stratigraphic unit ⓘ |
| containsFossilGroup |
bivalves
ⓘ
charophytes ⓘ crocodyliforms ⓘ early mammals ⓘ gastropods ⓘ ornithopod dinosaurs ⓘ ostracods ⓘ pollen and spores ⓘ sauropod dinosaurs ⓘ stegosaurian dinosaurs ⓘ theropod dinosaurs ⓘ turtles ⓘ |
| containsFossilTaxon |
Allosaurus
ⓘ
Apatosaurus ⓘ Brachiosaurus ⓘ Camarasaurus ⓘ Diplodocus ⓘ Dryosaurus ⓘ Othnielosaurus ⓘ Stegosaurus ⓘ |
| containsRockType | conglomerate ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| depositionalEnvironment |
eolian
ⓘ
floodplain ⓘ fluvial ⓘ lacustrine ⓘ |
| discoveredIn | 19th century ⓘ |
| fossilRichness | exceptionally rich dinosaur fossil assemblage ⓘ |
| geographicExtent |
from Arizona to South Dakota
ⓘ
from New Mexico to Montana ⓘ |
| geologicAgeRange |
Kimmeridgian limestone
ⓘ
surface form:
Kimmeridgian
Tithonian ⓘ |
| geologicGroup | San Rafael Group ⓘ |
| geologicPeriod | Late Jurassic ⓘ |
| locatedInRegion | western United States ⓘ |
| namedFor | Morrison, Colorado ⓘ |
| notableLocality |
Cleveland-Lloyd Dinosaur Quarry
ⓘ
Como Bluff ⓘ Dinosaur National Monument ⓘ Garden Park, Colorado ⓘ |
| overlies |
Summerville Formation
ⓘ
Sundance Formation ⓘ |
| paleontologicalSignificance | one of the most productive dinosaur-bearing formations in the world ⓘ |
| primaryLithology |
limestone
ⓘ
mudstone ⓘ sandstone ⓘ siltstone ⓘ |
| thickness | up to about 300 meters ⓘ |
| timeSpanEndMa | approximately 146 ⓘ |
| timeSpanStartMa | approximately 156 ⓘ |
| underlies |
Cloverly Formation
ⓘ
Dakota 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: Morrison Formation Description of subject: 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.
Referenced by (33)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Upper Morrison Formation
this entity surface form:
Morrison Formation, western United States
this entity surface form:
Brushy Basin Member of the Morrison Formation
this entity surface form:
Morrison Formation dinosaur-bearing beds