Lewisian complex basement
E154086
The Lewisian complex basement is an ancient Precambrian assemblage of highly metamorphosed gneisses and related rocks forming part of the geological foundation of northwest Scotland and the Outer Hebrides.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Lewisian Gneiss Complex | 1 |
| Lewisian complex | 1 |
| Lewisian complex basement canonical | 1 |
| Lewisian gneiss complex | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1343597 — 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: Lewisian complex basement Context triple: [Dalradian Supergroup, overlies, Lewisian complex basement]
-
A.
Dalradian Supergroup
The Dalradian Supergroup is a thick sequence of late Precambrian to early Paleozoic metamorphic sedimentary and volcanic rocks extensively exposed in the Scottish Highlands and parts of Ireland.
-
B.
Coast Plutonic Complex
The Coast Plutonic Complex is a vast belt of granitic and related intrusive rocks forming the core of the Coast Mountains along the Pacific margin of western North America.
-
C.
Southern Uplands terrane
The Southern Uplands terrane is a geological region in southern Scotland composed mainly of deformed and folded sedimentary rocks, representing an ancient accretionary prism formed during the closure of the Iapetus Ocean.
-
D.
Grampian Terrane
The Grampian Terrane is a major geological block in Scotland characterized by ancient metamorphic and igneous rocks that form much of the Grampian Highlands.
-
E.
Caledonian orogeny
The Caledonian orogeny was a major Paleozoic mountain-building event that formed ranges across what are now Scandinavia, Scotland, Ireland, Greenland, and parts of North America as ancient continents collided.
- 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: Lewisian complex basement Target entity description: The Lewisian complex basement is an ancient Precambrian assemblage of highly metamorphosed gneisses and related rocks forming part of the geological foundation of northwest Scotland and the Outer Hebrides.
-
A.
Dalradian Supergroup
The Dalradian Supergroup is a thick sequence of late Precambrian to early Paleozoic metamorphic sedimentary and volcanic rocks extensively exposed in the Scottish Highlands and parts of Ireland.
-
B.
Coast Plutonic Complex
The Coast Plutonic Complex is a vast belt of granitic and related intrusive rocks forming the core of the Coast Mountains along the Pacific margin of western North America.
-
C.
Southern Uplands terrane
The Southern Uplands terrane is a geological region in southern Scotland composed mainly of deformed and folded sedimentary rocks, representing an ancient accretionary prism formed during the closure of the Iapetus Ocean.
-
D.
Grampian Terrane
The Grampian Terrane is a major geological block in Scotland characterized by ancient metamorphic and igneous rocks that form much of the Grampian Highlands.
-
E.
Caledonian orogeny
The Caledonian orogeny was a major Paleozoic mountain-building event that formed ranges across what are now Scandinavia, Scotland, Ireland, Greenland, and parts of North America as ancient continents collided.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Precambrian basement complex
ⓘ
gneiss complex ⓘ high-grade metamorphic terrane ⓘ |
| composedOf |
amphibolite-facies gneiss
ⓘ
granulite-facies gneiss ⓘ mafic dykes ⓘ metasedimentary rocks ⓘ metavolcanic rocks ⓘ |
| composedPrimarilyOf | gneiss ⓘ |
| contains |
Scourie dykes
ⓘ
granite intrusions ⓘ migmatites ⓘ shear zones ⓘ |
| correlatesWith |
Greenland Shield
ⓘ
surface form:
Nagssugtoqidian and Ketilidian belts of Greenland
|
| country | Scotland ⓘ |
| exposedIn |
Assynt
ⓘ
Harris ⓘ Lewis ⓘ Scourie ⓘ |
| formsBasementTo |
Northwest Highlands
ⓘ
Outer Hebrides ⓘ |
| formsPartOf |
North American continental margin
ⓘ
surface form:
Laurentian continental margin
|
| geologicalAge |
Archaean
ⓘ
Palaeoproterozoic ⓘ |
| hasKeyLocality |
Assynt
ⓘ
surface form:
Assynt, Sutherland
Lewis and Harris ⓘ
surface form:
Lewis and Harris, Outer Hebrides
Scourie ⓘ
surface form:
Scourie, Sutherland
Ullapool ⓘ
surface form:
Ullapool area
|
| hasMetamorphicGrade |
amphibolite facies
ⓘ
granulite facies ⓘ |
| lithology | banded tonalitic to granodioritic gneiss ⓘ |
| locatedIn |
Outer Hebrides
ⓘ
northwest Scotland ⓘ |
| maximumAgeMa | ca. 1700 ⓘ |
| minimumAgeMa | ca. 3000 ⓘ |
| namedAfter | Isle of Lewis ⓘ |
| overlainUnconformablyBy |
Cambrian sedimentary rocks
ⓘ
Torridonian Supergroup ⓘ |
| partOf |
Caledonian fault system
ⓘ
surface form:
Caledonian foreland
North Atlantic Craton ⓘ |
| region | Scottish Highlands ⓘ |
| researchUse | study of Precambrian tectonics and metamorphism ⓘ |
| significance | records early crustal evolution of the North Atlantic region ⓘ |
| structuralStyle | complexly folded and faulted gneiss terrane ⓘ |
| tectonicHistory |
multiple deformation phases
ⓘ
multiple high-grade metamorphic events ⓘ |
| underlies |
Moine Supergroup
ⓘ
Torridonian Sandstone ⓘ |
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: Lewisian complex basement Description of subject: The Lewisian complex basement is an ancient Precambrian assemblage of highly metamorphosed gneisses and related rocks forming part of the geological foundation of northwest Scotland and the Outer Hebrides.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lewisian Gneiss Complex
this entity surface form:
Lewisian complex
this entity surface form:
Lewisian gneiss complex