Yoldia Sea
E27339
The Yoldia Sea was an early post-glacial brackish water stage of the Baltic basin that existed after the last Ice Age, named after the bivalve Yoldia arctica found in its sediments.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Yoldia Sea canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T133387 — 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: Yoldia Sea Context triple: [Baltic Sea, precededBy, Yoldia Sea]
-
A.
Kara Sea
The Kara Sea is a marginal sea of the Arctic Ocean off northern Siberia, known for its harsh ice conditions, shallow waters, and proximity to major Russian river outlets like the Ob and Yenisei.
-
B.
Chukchi Sea
The Chukchi Sea is a marginal sea of the Arctic Ocean located between Alaska and Siberia, known for its icy waters, rich marine life, and strategic importance for Arctic shipping routes.
-
C.
East Siberian Sea
The East Siberian Sea is a remote, shallow marginal sea off the northern coast of Siberia, lying between the Laptev and Chukchi Seas in the Arctic Ocean and remaining ice-covered for much of the year.
-
D.
Laptev Sea
The Laptev Sea is a marginal sea of the Arctic Ocean off the northern coast of Siberia, known for its extensive sea ice and role as a major source of Arctic sea ice formation.
-
E.
Sea of Okhotsk
The Sea of Okhotsk is a marginal sea of the western Pacific Ocean bordered by Russia and Japan, known for its rich fisheries, seasonal sea ice, and harsh subarctic climate.
- 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: Yoldia Sea Target entity description: The Yoldia Sea was an early post-glacial brackish water stage of the Baltic basin that existed after the last Ice Age, named after the bivalve Yoldia arctica found in its sediments.
-
A.
Kara Sea
The Kara Sea is a marginal sea of the Arctic Ocean off northern Siberia, known for its harsh ice conditions, shallow waters, and proximity to major Russian river outlets like the Ob and Yenisei.
-
B.
Chukchi Sea
The Chukchi Sea is a marginal sea of the Arctic Ocean located between Alaska and Siberia, known for its icy waters, rich marine life, and strategic importance for Arctic shipping routes.
-
C.
East Siberian Sea
The East Siberian Sea is a remote, shallow marginal sea off the northern coast of Siberia, lying between the Laptev and Chukchi Seas in the Arctic Ocean and remaining ice-covered for much of the year.
-
D.
Laptev Sea
The Laptev Sea is a marginal sea of the Arctic Ocean off the northern coast of Siberia, known for its extensive sea ice and role as a major source of Arctic sea ice formation.
-
E.
Sea of Okhotsk
The Sea of Okhotsk is a marginal sea of the western Pacific Ocean bordered by Russia and Japan, known for its rich fisheries, seasonal sea ice, and harsh subarctic climate.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
brackish water basin
ⓘ
paleogeographic water body ⓘ post-glacial stage of the Baltic Sea ⓘ |
| basin |
Baltic Sea
ⓘ
surface form:
Baltic basin
|
| characterizedBy |
Yoldia arctica shells in sediments
ⓘ
brackish fauna ⓘ marine transgression ⓘ post-glacial isostatic rebound ⓘ |
| chronologicalPosition | between Baltic Ice Lake and Ancylus Lake stages ⓘ |
| connectedTo |
Atlantic Ocean
ⓘ
World Ocean ⓘ |
| environment |
cold climate
ⓘ
subarctic conditions ⓘ |
| followed | Baltic Ice Lake ⓘ |
| formedAfter |
Pleistocene epoch
ⓘ
surface form:
Last Glacial Period
Fennoscandian Ice Sheet ⓘ
surface form:
Weichselian glaciation
|
| geologicalAge | early Holocene ⓘ |
| hasCause |
eustatic sea-level rise
ⓘ
isostatic land uplift ⓘ retreat of continental ice sheet ⓘ |
| hasEvidence |
marine clay deposits
ⓘ
microfossils in sediment cores ⓘ |
| hasFossil |
Yoldia arctica
ⓘ
brackish-water molluscs ⓘ |
| hasLanguageName |
Yoldiahavet (Swedish)
ⓘ
Yoldiameren (Finnish) ⓘ |
| hasSediments |
clay
ⓘ
silt ⓘ |
| locatedIn |
Baltic Sea coast region
ⓘ
surface form:
Baltic region
Northern Europe ⓘ |
| namedAfter | Yoldia arctica ⓘ |
| partOf |
Baltic Sea evolution
ⓘ
Baltic Sea history ⓘ Baltic Sea stages ⓘ post-glacial Baltic development ⓘ |
| preceded | Ancylus Lake ⓘ |
| predecessor | Baltic Ice Lake ⓘ |
| replacedBy | Ancylus Lake ⓘ |
| salinity | low salinity ⓘ |
| studiedInDiscipline |
Quaternary geology
ⓘ
paleoclimatology ⓘ paleogeography ⓘ |
| timePeriodEnd | approximately 9,500 years before present ⓘ |
| timePeriodStart | approximately 10,300 years before present ⓘ |
| waterType | brackish water ⓘ |
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: Yoldia Sea Description of subject: The Yoldia Sea was an early post-glacial brackish water stage of the Baltic basin that existed after the last Ice Age, named after the bivalve Yoldia arctica found in its sediments.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Yoldiahavet