Sundance Formation
E273049
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sundance Formation canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T2509900 — 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: Sundance Formation Context triple: [Morrison Formation, overlies, Sundance Formation]
-
A.
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.
-
B.
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.
-
C.
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.
-
D.
Palisade Basin
Palisade Basin is a high-elevation alpine basin in California’s Sierra Nevada, known for its rugged granite peaks, glacial lakes, and remote backcountry setting.
-
E.
Carrizo Badlands
Carrizo Badlands is a rugged, arid landscape of deeply eroded canyons and badland formations located in Southern California’s desert region.
- 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: Sundance Formation Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
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.
-
D.
Palisade Basin
Palisade Basin is a high-elevation alpine basin in California’s Sierra Nevada, known for its rugged granite peaks, glacial lakes, and remote backcountry setting.
-
E.
Carrizo Badlands
Carrizo Badlands is a rugged, arid landscape of deeply eroded canyons and badland formations located in Southern California’s desert region.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
sedimentary rock unit ⓘ |
| age | approximately 174–163 million years ago ⓘ |
| contains |
bioturbated horizons
ⓘ
marine trace fossils ⓘ offshore marine mudstones ⓘ shoreface deposits ⓘ storm-influenced sandstone beds ⓘ tidal flat deposits ⓘ |
| containsLithology |
dolomite
ⓘ
limestone ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalSetting | shelf and nearshore marine ⓘ |
| environmentOfDeposition | shallow epicontinental sea ⓘ |
| fossilContent |
ammonites
ⓘ
belemnites ⓘ bivalves ⓘ marine invertebrate fossils ⓘ marine reptiles ⓘ |
| geologicPeriod |
Late Jurassic
ⓘ
Middle Jurassic ⓘ |
| hasStratigraphicRelationship |
conformable with underlying units in many areas
ⓘ
disconformable with underlying units in some areas ⓘ |
| isSourceOf | ammonite biostratigraphic data ⓘ |
| lithology | marine sedimentary rock ⓘ |
| locatedInRegion | western United States ⓘ |
| memberOf | Sundance Sea succession ⓘ |
| namedFor | Sundance, Wyoming ⓘ |
| overlainBy | Morrison Formation ⓘ |
| overlies |
Chugwater Group
ⓘ
linked to:
Supai Group
Gypsum Spring Formation ⓘ Nugget Sandstone ⓘ |
| paleoclimate | warm, shallow marine conditions ⓘ |
| paleogeography | deposited in the Sundance Sea ⓘ |
| partOf |
Jurassic System
ⓘ
linked to:
Jurassic Period
|
| primaryLithology |
sandstone
ⓘ
shale ⓘ siltstone ⓘ |
| stratigraphicUnitOf |
Colorado
ⓘ
Idaho ⓘ Montana ⓘ North Dakota ⓘ South Dakota ⓘ Utah ⓘ Wyoming ⓘ |
| system | Jurassic ⓘ |
| underlies | Morrison 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: Sundance Formation Description of subject: 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.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.