Etchegoin Formation
E615899
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Etchegoin Formation canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6706560 — 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: Etchegoin Formation Context triple: [Belridge Oil Field, primaryProducingFormation, Etchegoin Formation]
-
A.
Vermejo Formation
The Vermejo Formation is a Late Cretaceous sedimentary rock unit in the Raton Basin of the western United States, known for its coal-bearing strata and significance in regional stratigraphy.
-
B.
Areyonga Formation
The Areyonga Formation is a geological rock unit within central Australia's Amadeus Basin, known for its sedimentary sequences that record Proterozoic environmental and tectonic history.
-
C.
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.
-
D.
Djadokhta Formation
The Djadokhta Formation is a Late Cretaceous sedimentary rock unit in Mongolia renowned for its exceptionally well-preserved dinosaur fossils, including iconic theropods and other desert-adapted fauna.
-
E.
Barun Goyot Formation
The Barun Goyot Formation is a Late Cretaceous sedimentary rock formation in Mongolia renowned for its rich fossil beds, including remains of the dinosaur Velociraptor.
- 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: Etchegoin Formation Target entity description: 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.
-
A.
Vermejo Formation
The Vermejo Formation is a Late Cretaceous sedimentary rock unit in the Raton Basin of the western United States, known for its coal-bearing strata and significance in regional stratigraphy.
-
B.
Areyonga Formation
The Areyonga Formation is a geological rock unit within central Australia's Amadeus Basin, known for its sedimentary sequences that record Proterozoic environmental and tectonic history.
-
C.
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.
-
D.
Djadokhta Formation
The Djadokhta Formation is a Late Cretaceous sedimentary rock unit in Mongolia renowned for its exceptionally well-preserved dinosaur fossils, including iconic theropods and other desert-adapted fauna.
-
E.
Barun Goyot Formation
The Barun Goyot Formation is a Late Cretaceous sedimentary rock formation in Mongolia renowned for its rich fossil beds, including remains of the dinosaur Velociraptor.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
stratigraphic unit ⓘ |
| associatedWith | San Andreas Fault system NERFINISHED ⓘ |
| contains | petroleum reservoirs ⓘ |
| containsFossilsOf |
foraminifera
ⓘ
marine invertebrates ⓘ mollusks ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| depositionalSetting | forearc basin ⓘ |
| environmentOfDeposition |
deltaic
ⓘ
shallow marine ⓘ |
| geologicAge |
Neogene
ⓘ
Pliocene NERFINISHED ⓘ |
| hasEconomicImportance | hydrocarbon production ⓘ |
| hasResource |
natural gas
ⓘ
oil ⓘ |
| hasRockType | clastic sedimentary rocks ⓘ |
| hasStratigraphicThickness | hundreds of meters ⓘ |
| isReservoirFor |
Belridge Oil Field
NERFINISHED
ⓘ
Kettleman Middle Dome Oil Field NERFINISHED ⓘ Kettleman North Dome Oil Field NERFINISHED ⓘ Kettleman South Dome Oil Field NERFINISHED ⓘ Lost Hills Oil Field NERFINISHED ⓘ various San Joaquin Basin oil fields ⓘ |
| lithology |
conglomerate
ⓘ
sandstone ⓘ shale ⓘ siltstone ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Fresno County, California NERFINISHED ⓘ Kern County, California NERFINISHED ⓘ Kings County, California NERFINISHED ⓘ San Joaquin Basin NERFINISHED ⓘ San Joaquin Valley NERFINISHED ⓘ |
| namedFor | Etchegoin area of the San Joaquin Valley ⓘ |
| overlies |
Antelope Shale
NERFINISHED
ⓘ
Monterey Formation NERFINISHED ⓘ |
| partOf |
San Joaquin Basin stratigraphic sequence
ⓘ
San Joaquin Valley petroleum system NERFINISHED ⓘ |
| region | Central California NERFINISHED ⓘ |
| studiedBy |
petroleum geologists
ⓘ
stratigrapher ⓘ |
| underlies | San Joaquin Formation NERFINISHED ⓘ |
| usedFor |
biostratigraphy
ⓘ
petroleum exploration ⓘ subsurface correlation ⓘ |
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: Etchegoin Formation Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.