London Clay Formation
E401564
The London Clay Formation is an early Eocene marine clay deposit in southeast England, renowned for its rich fossil content and its importance in shaping the geology and engineering properties of the London area.
All labels observed (2)
| Label | Occurrences |
|---|---|
| London Clay Formation canonical | 6 |
| London Clay | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3962344 — 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: London Clay Formation Context triple: [London Basin, overlainBy, London Clay Formation]
-
A.
Oxford Clay
Oxford Clay is a Jurassic-age marine sedimentary rock formation in England renowned for its exceptionally well-preserved fossils, especially marine reptiles and invertebrates.
-
B.
Kellaways Formation
The Kellaways Formation is a Middle Jurassic geological formation in England composed mainly of sandstones and mudstones, representing shallow marine and deltaic environments.
-
C.
Bedford limestone
Bedford limestone is a high-quality, fine-grained building stone from southern Indiana widely used in prominent architectural landmarks across the United States.
-
D.
Yorkshire Jurassic limestone belt
The Yorkshire Jurassic limestone belt is a geological formation in northern England characterized by extensive Jurassic-age limestone deposits that have historically been quarried for building stone and industrial use.
-
E.
Southern England Chalk Formation
The Southern England Chalk Formation is a major geological unit of Cretaceous-age chalk that underlies and shapes much of southern England’s landscape, including prominent hill ranges and downlands.
- 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: London Clay Formation Target entity description: The London Clay Formation is an early Eocene marine clay deposit in southeast England, renowned for its rich fossil content and its importance in shaping the geology and engineering properties of the London area.
-
A.
Oxford Clay
Oxford Clay is a Jurassic-age marine sedimentary rock formation in England renowned for its exceptionally well-preserved fossils, especially marine reptiles and invertebrates.
-
B.
Kellaways Formation
The Kellaways Formation is a Middle Jurassic geological formation in England composed mainly of sandstones and mudstones, representing shallow marine and deltaic environments.
-
C.
Bedford limestone
Bedford limestone is a high-quality, fine-grained building stone from southern Indiana widely used in prominent architectural landmarks across the United States.
-
D.
Yorkshire Jurassic limestone belt
The Yorkshire Jurassic limestone belt is a geological formation in northern England characterized by extensive Jurassic-age limestone deposits that have historically been quarried for building stone and industrial use.
-
E.
Southern England Chalk Formation
The Southern England Chalk Formation is a major geological unit of Cretaceous-age chalk that underlies and shapes much of southern England’s landscape, including prominent hill ranges and downlands.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
clay formation
ⓘ
geologic formation ⓘ stratigraphic unit ⓘ |
| age | Ypresian ⓘ |
| color |
brown when weathered
ⓘ
dark bluish-grey when fresh ⓘ |
| containsFossilsOf |
early Eocene birds
ⓘ
early Eocene flora ⓘ early Eocene mammals ⓘ early Eocene reptiles ⓘ marine invertebrates ⓘ |
| country | United Kingdom ⓘ |
| discoveredIn | 19th century (formal geological description) ⓘ |
| documentedBy | British Geological Survey ⓘ |
| environmentOfDeposition |
marine
ⓘ
shallow marine shelf ⓘ |
| exposedAt |
Bognor Regis coast
ⓘ
Isle of Sheppey ⓘ Isle of Wight ⓘ Thames estuary cliffs ⓘ |
| geologicEpoch | Early Eocene ⓘ |
| geologicPeriod | Eocene ⓘ |
| hasMember |
Bognor Regis Member
ⓘ
Claygate Member ⓘ Sheppey Member ⓘ Walton Member ⓘ |
| hasProperty |
high plasticity
ⓘ
low permeability ⓘ susceptible to landslides ⓘ swelling and shrinkage on wetting and drying ⓘ |
| importantFor |
engineering geology of London
ⓘ
foundation design in southeast England ⓘ tunnelling conditions in London ⓘ |
| lithology |
clay
ⓘ
mudstone ⓘ sandy clay ⓘ silty clay ⓘ |
| locatedIn |
Hampshire Basin
ⓘ
London Basin ⓘ southeast England ⓘ |
| namedFor |
London, England
ⓘ
surface form:
London
|
| notableFor |
rich fossil content
ⓘ
vertebrate fossils ⓘ well-preserved insect fossils ⓘ well-preserved plant fossils ⓘ |
| overlies |
Oldhaven Formation
ⓘ
Reading Formation ⓘ |
| partOf |
Paleogene
ⓘ
surface form:
Paleogene System
|
| thickness | up to about 150 m ⓘ |
| underlies |
Bagshot Formation
ⓘ
Bracklesham Group ⓘ |
| usedIn | brickmaking ⓘ |
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: London Clay Formation Description of subject: The London Clay Formation is an early Eocene marine clay deposit in southeast England, renowned for its rich fossil content and its importance in shaping the geology and engineering properties of the London area.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
London Clay
this entity surface form:
London Clay