Illinoian Stage
E1010745
The Illinoian Stage is a major North American glacial period that occurred before the last Ice Age, marked by extensive ice sheet advances across the central United States.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Illinoian Stage canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T12924462 — 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: Illinoian Stage Context triple: [Wisconsin Stage, precededBy, Illinoian Stage]
-
A.
Aquitanian Stage
The Aquitanian Stage is the earliest age of the Miocene Epoch, marking a distinct interval in Earth’s geologic time characterized by significant climatic and faunal transitions.
-
B.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
C.
Mississippian period
The Mississippian period was a pre-Columbian era in North America characterized by complex mound-building societies, intensive agriculture, and large, hierarchical settlements centered along the Mississippi River and its tributaries.
-
D.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
-
E.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil record.
- 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: Illinoian Stage Target entity description: The Illinoian Stage is a major North American glacial period that occurred before the last Ice Age, marked by extensive ice sheet advances across the central United States.
-
A.
Aquitanian Stage
The Aquitanian Stage is the earliest age of the Miocene Epoch, marking a distinct interval in Earth’s geologic time characterized by significant climatic and faunal transitions.
-
B.
Cisuralian Epoch
The Cisuralian Epoch is the earliest subdivision of the Permian, marking a time of significant diversification of terrestrial life and continued development of early amniotes following the late Paleozoic ice age.
-
C.
Mississippian period
The Mississippian period was a pre-Columbian era in North America characterized by complex mound-building societies, intensive agriculture, and large, hierarchical settlements centered along the Mississippi River and its tributaries.
-
D.
Pridoli Epoch
The Pridoli Epoch is the final epoch of the Silurian Period, marking a transitional interval in Earth’s history just before the onset of the Devonian.
-
E.
Terreneuvian
The Terreneuvian is the earliest age of the Cambrian Period, marking the beginning of the Phanerozoic Eon and the widespread appearance of complex animal life in the fossil record.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
North American glaciation
ⓘ
Pleistocene stratigraphic unit ⓘ glacial stage ⓘ |
| affects |
drainage patterns in the central United States
ⓘ
soil distribution in the Midwest ⓘ |
| characterizedBy |
extensive continental ice sheets
ⓘ
glacial erosion ⓘ glacial till deposition ⓘ loess deposition ⓘ outwash plains ⓘ |
| chronostratigraphicRank | stage ⓘ |
| climate | colder-than-present temperatures ⓘ |
| continent | North America ⓘ |
| correlatesWith |
Saale glaciation in Europe
ⓘ
linked to:
Wisconsin glaciation
|
| definedBy | glacial deposits in Illinois ⓘ |
| discipline |
Quaternary geology
ⓘ
glacial geology ⓘ stratigraphy ⓘ |
| evidence |
glacial erratics
ⓘ
glacial striations ⓘ moraines ⓘ till plains ⓘ |
| follows | Pre-Illinoian glaciations ⓘ |
| geochronologicRank | age ⓘ |
| geologicTimeScale |
Quaternary
ⓘ
linked to:
Quaternary period
|
| location |
Illinois
ⓘ
Indiana ⓘ Iowa ⓘ Kansas ⓘ Kentucky ⓘ Midwestern United States ⓘ Missouri ⓘ Nebraska ⓘ Ohio ⓘ Pennsylvania ⓘ central United States ⓘ |
| namedAfter | Illinois ⓘ |
| partOf |
Pleistocene Epoch
ⓘ
linked to:
Pleistocene epoch
|
| precedes |
Wisconsin Stage
ⓘ
Wisconsinan Glaciation ⓘ
linked to:
Wisconsin glaciation
|
| relativePosition |
older than Wisconsinan Glaciation
ⓘ
younger than Pre-Illinoian glaciations ⓘ |
| seaLevel | lower global sea level than present ⓘ |
| timeSpan | middle Pleistocene ⓘ |
| usedIn | North American Quaternary stratigraphy ⓘ |
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: Illinoian Stage Description of subject: The Illinoian Stage is a major North American glacial period that occurred before the last Ice Age, marked by extensive ice sheet advances across the central United States.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.