Matuyama reversed chron
E675179
The Matuyama reversed chron is a long interval of predominantly reversed geomagnetic polarity that followed the Gauss–Matuyama reversal and lasted from about 2.58 to 0.78 million years ago.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Matuyama reversed chron canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7581735 — 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: Matuyama reversed chron Context triple: [Gauss–Matuyama geomagnetic reversal, hasFollowingEvent, Matuyama reversed chron]
-
A.
Shinkiari
Shinkiari is a town in Pakistan’s Khyber Pakhtunkhwa province, known for its agricultural surroundings and its location along the Karakoram Highway near Mansehra.
-
B.
Miyawaka
Miyawaka is a city in Japan known for its location in northern Kyushu and its blend of industrial facilities and residential communities.
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C.
Takami-Musubi
Takami-Musubi is a primordial Shinto creator deity revered as one of the high heavenly gods who helped shape the cosmos in Japanese mythology.
-
D.
Madadayo
Madadayo is a 1993 Japanese drama film directed by Akira Kurosawa that poignantly portrays the later years of a beloved professor and his enduring bond with former students.
-
E.
Noboribetsu
Noboribetsu is a hot spring resort city in Hokkaido, Japan, famed for its dramatic volcanic landscapes and numerous onsen.
- 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: Matuyama reversed chron Target entity description: The Matuyama reversed chron is a long interval of predominantly reversed geomagnetic polarity that followed the Gauss–Matuyama reversal and lasted from about 2.58 to 0.78 million years ago.
-
A.
Shinkiari
Shinkiari is a town in Pakistan’s Khyber Pakhtunkhwa province, known for its agricultural surroundings and its location along the Karakoram Highway near Mansehra.
-
B.
Miyawaka
Miyawaka is a city in Japan known for its location in northern Kyushu and its blend of industrial facilities and residential communities.
-
C.
Takami-Musubi
Takami-Musubi is a primordial Shinto creator deity revered as one of the high heavenly gods who helped shape the cosmos in Japanese mythology.
-
D.
Madadayo
Madadayo is a 1993 Japanese drama film directed by Akira Kurosawa that poignantly portrays the later years of a beloved professor and his enduring bond with former students.
-
E.
Noboribetsu
Noboribetsu is a hot spring resort city in Hokkaido, Japan, famed for its dramatic volcanic landscapes and numerous onsen.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
geomagnetic chron
ⓘ
reversed polarity interval ⓘ |
| boundaryEvent | Brunhes–Matuyama reversal NERFINISHED ⓘ |
| chronCode | C2r ⓘ |
| contains |
Jaramillo subchron
NERFINISHED
ⓘ
Olduvai subchron NERFINISHED ⓘ |
| duration | about 1.8 million years ⓘ |
| endTime | about 0.78 million years ago ⓘ |
| era | Cenozoic NERFINISHED ⓘ |
| evidenceFrom |
lava flow magnetization
ⓘ
marine magnetic anomalies ⓘ sedimentary rock remanent magnetization ⓘ |
| fieldType | dipolar-dominated geomagnetic field ⓘ |
| follows | Gauss–Matuyama reversal NERFINISHED ⓘ |
| hasPolarity | reversed ⓘ |
| includesAge | Pleistocene ⓘ |
| lowerBoundaryDefinedBy | Gauss–Matuyama reversal NERFINISHED ⓘ |
| magneticFieldConfiguration | south magnetic pole near geographic north ⓘ |
| namedAfter | Motonori Matuyama NERFINISHED ⓘ |
| partOf | Cenozoic geomagnetic polarity timescale NERFINISHED ⓘ |
| period | Quaternary ⓘ |
| polarityRelativeToPresent | opposite ⓘ |
| precededBy | Gauss normal chron NERFINISHED ⓘ |
| precedes | Brunhes normal chron ⓘ |
| startTime | about 2.58 million years ago ⓘ |
| upperBoundaryDefinedBy | Brunhes–Matuyama reversal NERFINISHED ⓘ |
| usedFor |
dating sedimentary sequences
ⓘ
dating volcanic rocks ⓘ geologic time correlation ⓘ |
| usedIn | magnetostratigraphy ⓘ |
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: Matuyama reversed chron Description of subject: The Matuyama reversed chron is a long interval of predominantly reversed geomagnetic polarity that followed the Gauss–Matuyama reversal and lasted from about 2.58 to 0.78 million years ago.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.