Marcellus Shale
E917246
Marcellus Shale is a vast natural gas–rich sedimentary rock formation underlying much of the Appalachian Basin in the eastern United States, notably Pennsylvania, West Virginia, Ohio, and New York.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Marcellus Shale canonical | 2 |
| Marcellus Shale gas production region | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11308330 — 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: Marcellus Shale Context triple: [East Resources, locationOfOperations, Marcellus Shale]
-
A.
Morgan Valley
Morgan Valley is a scenic agricultural and residential valley in northern Utah, known for its rural communities and outdoor recreation opportunities.
-
B.
Bakken
Bakken is a surname most notably associated with Earl Bakken, the American engineer and co-founder of the medical device company Medtronic.
-
C.
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.
-
D.
Vaca Muerta shale formation
Vaca Muerta shale formation is a vast, hydrocarbon-rich shale play in Argentina that is one of the world’s largest unconventional oil and gas reserves.
-
E.
Murray formation
The Murray formation is a sedimentary rock unit on Mars within Gale Crater, studied by the Curiosity rover for its record of ancient lake and habitable environments.
- 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: Marcellus Shale Target entity description: Marcellus Shale is a vast natural gas–rich sedimentary rock formation underlying much of the Appalachian Basin in the eastern United States, notably Pennsylvania, West Virginia, Ohio, and New York.
-
A.
Morgan Valley
Morgan Valley is a scenic agricultural and residential valley in northern Utah, known for its rural communities and outdoor recreation opportunities.
-
B.
Bakken
Bakken is a surname most notably associated with Earl Bakken, the American engineer and co-founder of the medical device company Medtronic.
-
C.
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.
-
D.
Vaca Muerta shale formation
Vaca Muerta shale formation is a vast, hydrocarbon-rich shale play in Argentina that is one of the world’s largest unconventional oil and gas reserves.
-
E.
Murray formation
The Murray formation is a sedimentary rock unit on Mars within Gale Crater, studied by the Curiosity rover for its record of ancient lake and habitable environments.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
natural gas field ⓘ shale formation ⓘ unconventional gas reservoir ⓘ |
| associatedWith |
environmental concerns about groundwater contamination
ⓘ
induced seismicity from wastewater injection ⓘ |
| contains |
carbonate concretions
ⓘ
fossil organic matter ⓘ minor sandstone beds ⓘ natural gas ⓘ organic-rich mudstone ⓘ pyrite ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalEnvironment | marine ⓘ |
| economicImportance | major natural gas resource in the United States ⓘ |
| energySector | natural gas production ⓘ |
| exploitedBy |
horizontal drilling
ⓘ
hydraulic fracturing ⓘ |
| formationThickness | varies from tens to hundreds of feet ⓘ |
| geologicAge | Middle Devonian ⓘ |
| hasResourceType | fossil fuel ⓘ |
| hydrocarbonType |
dry gas
ⓘ
wet gas ⓘ |
| isTypeOf |
reservoir rock
ⓘ
source rock ⓘ unconventional hydrocarbon resource ⓘ |
| lithology |
black shale
ⓘ
shale ⓘ |
| locatedIn | Appalachian Basin ⓘ |
| namedAfter | Marcellus, New York ⓘ |
| overlainBy | Hamilton Group ⓘ |
| partOf |
Appalachian gas plays
ⓘ
Devonian rock units ⓘ |
| playsRoleIn | U.S. energy independence discussions ⓘ |
| regulatoryJurisdiction |
state governments of New York
ⓘ
state governments of Ohio ⓘ state governments of Pennsylvania ⓘ state governments of West Virginia ⓘ |
| stratigraphicUnitOf | Appalachian Basin stratigraphy ⓘ |
| underlainBy |
Onondaga Limestone
ⓘ
linked to:
Onondaga limestone
|
| underliesRegion |
Kentucky
ⓘ
Maryland ⓘ New York ⓘ Ohio ⓘ Pennsylvania ⓘ Tennessee ⓘ Virginia ⓘ West Virginia ⓘ |
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: Marcellus Shale Description of subject: Marcellus Shale is a vast natural gas–rich sedimentary rock formation underlying much of the Appalachian Basin in the eastern United States, notably Pennsylvania, West Virginia, Ohio, and New York.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Marcellus Shale