Calvert Formation
E421005
The Calvert Formation is a geologic formation along the Chesapeake Bay in Maryland, renowned for its Miocene-age marine sediments and abundant fossil beds exposed in the Calvert Cliffs.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Calvert Formation canonical | 2 |
| Choptank Formation | 2 |
| St. Marys Formation | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4218910 — 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: Calvert Formation Context triple: [Calvert Cliffs, partOf, Calvert Formation]
-
A.
Holston Formation
The Holston Formation is a geologic unit in eastern Tennessee renowned for its high-quality crystalline limestone commonly marketed as Tennessee marble and widely used in prominent architectural projects.
-
B.
Cloverly Formation
The Cloverly Formation is an Early Cretaceous geologic formation in the western United States known for its dinosaur fossils and fluvial sedimentary deposits.
-
C.
Summerville Formation
The Summerville Formation is a Late Jurassic sedimentary rock unit in the western United States, characterized by thin-bedded mudstones and sandstones deposited in tidal flat and coastal environments.
-
D.
Claron Formation
The Claron Formation is a geologic rock unit of colorful limestones and mudstones best known for forming the striking hoodoos and cliffs of Bryce Canyon and other parts of the Paunsaugunt Plateau in southern Utah.
-
E.
Fox Hills Formation
The Fox Hills Formation is a Late Cretaceous geologic unit in the Western Interior of North America, known for its marine to marginal-marine sandstones that record the final retreat of the Western Interior Seaway.
- 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: Calvert Formation Target entity description: The Calvert Formation is a geologic formation along the Chesapeake Bay in Maryland, renowned for its Miocene-age marine sediments and abundant fossil beds exposed in the Calvert Cliffs.
-
A.
Holston Formation
The Holston Formation is a geologic unit in eastern Tennessee renowned for its high-quality crystalline limestone commonly marketed as Tennessee marble and widely used in prominent architectural projects.
-
B.
Cloverly Formation
The Cloverly Formation is an Early Cretaceous geologic formation in the western United States known for its dinosaur fossils and fluvial sedimentary deposits.
-
C.
Summerville Formation
The Summerville Formation is a Late Jurassic sedimentary rock unit in the western United States, characterized by thin-bedded mudstones and sandstones deposited in tidal flat and coastal environments.
-
D.
Claron Formation
The Claron Formation is a geologic rock unit of colorful limestones and mudstones best known for forming the striking hoodoos and cliffs of Bryce Canyon and other parts of the Paunsaugunt Plateau in southern Utah.
-
E.
Fox Hills Formation
The Fox Hills Formation is a Late Cretaceous geologic unit in the Western Interior of North America, known for its marine to marginal-marine sandstones that record the final retreat of the Western Interior Seaway.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
geologic formation
ⓘ
stratigraphic unit ⓘ |
| adjacentTo | Chesapeake Bay ⓘ |
| ageRange | early to middle Miocene ⓘ |
| collectingSiteType | fossil collecting area ⓘ |
| contains |
diatom-rich layers
ⓘ
glauconitic sands ⓘ phosphatic beds ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalEnvironment |
continental shelf
ⓘ
shallow marine ⓘ |
| erosionalExpression | steep wave-cut cliffs ⓘ |
| exposedAt | Calvert Cliffs ⓘ |
| fossilContent |
cetacean remains
ⓘ
crustaceans ⓘ fish remains ⓘ mollusks ⓘ seabird remains ⓘ |
| geologicAge | Miocene ⓘ |
| geologicPeriod | Neogene ⓘ |
| geologicProvince |
Atlantic Coastal Plain Province
ⓘ
linked to:
Atlantic coastal plain
|
| hasStratigraphicMembers |
Drumcliff Member
ⓘ
Fairhaven Member ⓘ Plum Point Member ⓘ |
| importantFor |
biostratigraphy of the Miocene Atlantic Coastal Plain
ⓘ
paleoenvironmental reconstruction of the Chesapeake Bay region ⓘ |
| knownFor |
abundant marine fossils
ⓘ
invertebrate fossils ⓘ marine mammal fossils ⓘ shark teeth ⓘ |
| lithology |
clay
ⓘ
diatomaceous earth ⓘ marine sedimentary rocks ⓘ sand ⓘ silt ⓘ |
| locatedIn |
Maryland
ⓘ
Virginia ⓘ |
| namedAfter | Calvert County, Maryland ⓘ |
| overlies |
Aquia Formation
ⓘ
Nanjemoy Formation ⓘ |
| paleoclimate | warm-temperate marine ⓘ |
| partOf | Chesapeake Group ⓘ |
| region |
Atlantic Coastal Plain
ⓘ
linked to:
Atlantic coastal plain
|
| stratigraphicRank | formation ⓘ |
| typeLocality |
Calvert Cliffs, Maryland
ⓘ
linked to:
Calvert Cliffs
|
| underlies |
Choptank Formation
ⓘ
linked to:
Calvert Formation
St. Marys Formation ⓘ
linked to:
Calvert Formation
|
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: Calvert Formation Description of subject: The Calvert Formation is a geologic formation along the Chesapeake Bay in Maryland, renowned for its Miocene-age marine sediments and abundant fossil beds exposed in the Calvert Cliffs.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Calvert Formation
linked to: Calvert Formation
linked to: Calvert Formation
linked to: Calvert Formation