Three Forks formation
E631164
The Three Forks Formation is a Late Devonian sedimentary rock unit in the Williston Basin of North America, known as a significant tight oil reservoir underlying the Bakken Formation.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Three Forks formation canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6961163 — 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: Three Forks formation Context triple: [Bakken formation region, overlies, Three Forks formation]
-
A.
Wahweap Formation
The Wahweap Formation is a Late Cretaceous sedimentary rock unit in southern Utah renowned for its rich fossil record of dinosaurs and other ancient life.
-
B.
Goat Buttes
Goat Buttes is a distinctive rock formation and popular hiking and climbing destination located within Malibu Creek State Park in Southern California.
-
C.
Three Sisters rock formation
The Three Sisters rock formation is a famous trio of sandstone peaks and major tourist attraction in Australia’s Blue Mountains, renowned for its striking scenery and Aboriginal legends.
-
D.
Poison Canyon Formation
The Poison Canyon Formation is a geologic rock unit in the Raton Basin of Colorado and New Mexico, known for its Paleocene-age fluvial sandstones, mudstones, and coal beds that record post-dinosaur terrestrial environments.
-
E.
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.
- 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: Three Forks formation Target entity description: The Three Forks Formation is a Late Devonian sedimentary rock unit in the Williston Basin of North America, known as a significant tight oil reservoir underlying the Bakken Formation.
-
A.
Wahweap Formation
The Wahweap Formation is a Late Cretaceous sedimentary rock unit in southern Utah renowned for its rich fossil record of dinosaurs and other ancient life.
-
B.
Goat Buttes
Goat Buttes is a distinctive rock formation and popular hiking and climbing destination located within Malibu Creek State Park in Southern California.
-
C.
Three Sisters rock formation
The Three Sisters rock formation is a famous trio of sandstone peaks and major tourist attraction in Australia’s Blue Mountains, renowned for its striking scenery and Aboriginal legends.
-
D.
Poison Canyon Formation
The Poison Canyon Formation is a geologic rock unit in the Raton Basin of Colorado and New Mexico, known for its Paleocene-age fluvial sandstones, mudstones, and coal beds that record post-dinosaur terrestrial environments.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
sedimentary rock unit ⓘ tight oil reservoir ⓘ |
| basin | Williston Basin NERFINISHED ⓘ |
| continent | North America ⓘ |
| country |
Canada
ⓘ
United States of America ⓘ
surface form:
United States
|
| depositionalEnvironment |
restricted marine
ⓘ
shallow marine ⓘ tidal flat ⓘ |
| discoveredAsMajorPlay | early 2000s ⓘ |
| geologicAge | Late Devonian ⓘ |
| geologicPeriod | Devonian ⓘ |
| hasMember |
lower Three Forks member
ⓘ
middle Three Forks member ⓘ upper Three Forks member ⓘ |
| hasResource |
crude oil
ⓘ
natural gas ⓘ |
| hydrocarbonPlay | Bakken–Three Forks play NERFINISHED ⓘ |
| isSourceFor | light sweet crude ⓘ |
| lithology |
dolostone
ⓘ
limestone ⓘ shale ⓘ siltstone ⓘ |
| locatedIn | North America ⓘ |
| overlies |
Birdbear Formation
NERFINISHED
ⓘ
Torquay Formation NERFINISHED ⓘ |
| partOf | Williston Basin NERFINISHED ⓘ |
| porosityType |
fracture porosity
ⓘ
matrix porosity ⓘ |
| presentInStateOrProvince |
Manitoba
NERFINISHED
ⓘ
Montana NERFINISHED ⓘ North Dakota NERFINISHED ⓘ Saskatchewan NERFINISHED ⓘ South Dakota NERFINISHED ⓘ |
| productionMethod |
horizontal drilling
ⓘ
multistage hydraulic fracturing ⓘ |
| reservoirType |
tight oil reservoir
ⓘ
unconventional reservoir ⓘ |
| rockType |
carbonate
ⓘ
clastic sedimentary rock ⓘ |
| stratigraphicRelationship |
overlies Birdbear Formation
ⓘ
underlies Bakken Formation ⓘ |
| stratigraphicUnitOf | Williston Basin NERFINISHED ⓘ |
| subdivisionOf | Devonian System NERFINISHED ⓘ |
| underlies | Bakken Formation NERFINISHED ⓘ |
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: Three Forks formation Description of subject: The Three Forks Formation is a Late Devonian sedimentary rock unit in the Williston Basin of North America, known as a significant tight oil reservoir underlying the Bakken Formation.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.