Manhattan schist
E424600
Manhattan schist is a hard, coarse-grained metamorphic rock that forms much of Manhattan’s bedrock and is widely used as a local building and landscaping stone.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Manhattan schist canonical | 2 |
| New York City bedrock | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4240856 — 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: Manhattan schist Context triple: [Belvedere Castle, Central Park, materialUsed, Manhattan schist]
-
A.
Heavitree Quartzite
Heavitree Quartzite is a prominent Proterozoic quartzite rock formation in central Australia, notable for its extensive outcrops and role as a key stratigraphic unit in the region’s geological history.
-
B.
Hallowell granite
Hallowell granite is a durable, fine-grained granite historically quarried in Hallowell, Maine, widely used in prominent public buildings and monuments in the United States.
-
C.
Hawkesbury Sandstone
Hawkesbury Sandstone is a prominent Triassic sedimentary rock formation in the Sydney region of Australia, known for its thick, cliff-forming sandstone beds that shape much of the local landscape and geology.
-
D.
Millstone Grit
Millstone Grit is a coarse-grained Carboniferous sandstone formation in northern England, notably forming the rugged moorland landscapes of the Pennines.
-
E.
Bohemian sandstone
Bohemian sandstone is a durable, locally quarried sedimentary rock from the Bohemia region, historically used in many notable Central European buildings and monuments.
- 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: Manhattan schist Target entity description: Manhattan schist is a hard, coarse-grained metamorphic rock that forms much of Manhattan’s bedrock and is widely used as a local building and landscaping stone.
-
A.
Heavitree Quartzite
Heavitree Quartzite is a prominent Proterozoic quartzite rock formation in central Australia, notable for its extensive outcrops and role as a key stratigraphic unit in the region’s geological history.
-
B.
Hallowell granite
Hallowell granite is a durable, fine-grained granite historically quarried in Hallowell, Maine, widely used in prominent public buildings and monuments in the United States.
-
C.
Hawkesbury Sandstone
Hawkesbury Sandstone is a prominent Triassic sedimentary rock formation in the Sydney region of Australia, known for its thick, cliff-forming sandstone beds that shape much of the local landscape and geology.
-
D.
Millstone Grit
Millstone Grit is a coarse-grained Carboniferous sandstone formation in northern England, notably forming the rugged moorland landscapes of the Pennines.
-
E.
Bohemian sandstone
Bohemian sandstone is a durable, locally quarried sedimentary rock from the Bohemia region, historically used in many notable Central European buildings and monuments.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
metamorphic rock
ⓘ
schist ⓘ |
| belongsTo |
Manhattan Formation
ⓘ
New York City Group ⓘ |
| composedPrimarilyOf |
feldspar
ⓘ
mica ⓘ quartz ⓘ |
| formedDuring |
Acadian orogeny
ⓘ
Alleghanian orogeny ⓘ
linked to:
Appalachian orogeny
Taconic orogeny ⓘ |
| formedFrom |
mudstone
ⓘ
sedimentary protoliths ⓘ shale ⓘ |
| hasApproximateAge | Late Precambrian to Paleozoic ⓘ |
| hasColor |
dark gray
ⓘ
gray ⓘ greenish gray ⓘ |
| hasFoliation | schistosity ⓘ |
| hasHardness | hard ⓘ |
| hasMetamorphicGrade | medium- to high-grade metamorphism ⓘ |
| hasMineral |
biotite
ⓘ
garnet ⓘ kyanite ⓘ muscovite ⓘ staurolite ⓘ |
| hasProperty |
high strength
ⓘ
relatively low primary porosity ⓘ |
| hasStructuralFeature |
faults
ⓘ
folds ⓘ joints ⓘ |
| hasTexture | coarse-grained ⓘ |
| isExposedAt |
Central Park outcrops
ⓘ
Fort Tryon Park ⓘ Inwood Hill Park ⓘ Riverside Park ⓘ |
| isNamedAfter | Manhattan ⓘ |
| isPartOf |
Appalachian orogen
ⓘ
New England Upland geologic province ⓘ
linked to:
New England Upland
New York City bedrock ⓘ
linked to:
Manhattan schist
|
| locatedIn |
New York City
ⓘ
New York State ⓘ United States ⓘ
linked to:
United States of America
|
| supports | New York City skyscraper foundations ⓘ |
| underlies |
Central Park
ⓘ
Manhattan Island ⓘ Midtown Manhattan ⓘ Upper Manhattan ⓘ |
| usedFor |
building stone
ⓘ
landscaping stone ⓘ park outcrop features ⓘ retaining walls ⓘ |
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: Manhattan schist Description of subject: Manhattan schist is a hard, coarse-grained metamorphic rock that forms much of Manhattan’s bedrock and is widely used as a local building and landscaping stone.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Manhattan schist