Lyell Glacier
E48619
Lyell Glacier is a rapidly retreating mountain glacier in Yosemite National Park, historically the largest glacier in the park and situated on the slopes of Mount Lyell in the Sierra Nevada of California.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Lyell Glacier canonical | 3 |
| Lyell Glacier area | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T385266 — 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: Lyell Glacier Context triple: [Mount Lyell, hasGlacier, Lyell Glacier]
-
A.
Bionnassay Glacier
Bionnassay Glacier is a prominent alpine glacier on the western flank of the Mont Blanc massif in the French Alps.
-
B.
Heezen Glacier
Heezen Glacier is a large Antarctic glacier named in honor of American marine geologist Bruce C. Heezen.
-
C.
Miage Glacier
Miage Glacier is a large valley glacier on the Italian side of the Mont Blanc massif, notable for its extensive debris-covered surface.
-
D.
Polish Glacier
Polish Glacier is a prominent and challenging ice route on the eastern face of Aconcagua, renowned among mountaineers for its steep, high-altitude climbing.
-
E.
Mendenhall Glacier
Mendenhall Glacier is a 13-mile-long valley glacier in the Tongass National Forest of southeast Alaska, renowned for its striking blue ice, accessible visitor center, and dramatic retreat due to climate change.
- 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: Lyell Glacier Target entity description: Lyell Glacier is a rapidly retreating mountain glacier in Yosemite National Park, historically the largest glacier in the park and situated on the slopes of Mount Lyell in the Sierra Nevada of California.
-
A.
Bionnassay Glacier
Bionnassay Glacier is a prominent alpine glacier on the western flank of the Mont Blanc massif in the French Alps.
-
B.
Heezen Glacier
Heezen Glacier is a large Antarctic glacier named in honor of American marine geologist Bruce C. Heezen.
-
C.
Miage Glacier
Miage Glacier is a large valley glacier on the Italian side of the Mont Blanc massif, notable for its extensive debris-covered surface.
-
D.
Polish Glacier
Polish Glacier is a prominent and challenging ice route on the eastern face of Aconcagua, renowned among mountaineers for its steep, high-altitude climbing.
-
E.
Mendenhall Glacier
Mendenhall Glacier is a 13-mile-long valley glacier in the Tongass National Forest of southeast Alaska, renowned for its striking blue ice, accessible visitor center, and dramatic retreat due to climate change.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
glacier
ⓘ
mountain glacier ⓘ |
| accessedFrom |
John Muir Trail
ⓘ
Lyell Canyon ⓘ |
| climateSensitivity | high ⓘ |
| comparedWith | Maclure Glacier for retreat rates ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| drainsInto |
Lyell Fork of the Tuolumne River watershed
ⓘ
surface form:
Lyell Fork of the Tuolumne River
|
| elevation |
approximately 11,800–12,800 feet above sea level
ⓘ
approximately 3,600–3,900 meters above sea level ⓘ |
| evidenceFor | climate change in the Sierra Nevada ⓘ |
| firstAscentRegion | Mount Lyell climbing route ⓘ |
| geologicalPeriodOfFormation |
Holocene
ⓘ
surface form:
Late Holocene
|
| glacierType | cirque glacier ⓘ |
| hasChanged |
lost most of its surface area since the late 19th century
ⓘ
retreated upslope from former terminal moraine ⓘ thinned substantially since early 20th century ⓘ |
| hasFeature |
bergschrund at its head
ⓘ
crevassed ice surface ⓘ icefall sections ⓘ |
| hasPhotographicRecordSince | late 1800s ⓘ |
| historicalStatus | largest glacier in Yosemite National Park ⓘ |
| hydrologicalRole | seasonal meltwater source ⓘ |
| iceVolumeTrend | decreasing ⓘ |
| locatedIn |
Sierra Nevada
ⓘ
Tuolumne County ⓘ
surface form:
Tuolumne County, California
Yosemite National Park ⓘ |
| locatedOn | Mount Lyell ⓘ |
| managementAuthority |
National Park Service
ⓘ
surface form:
U.S. National Park Service
|
| monitoredBy |
National Park Service
ⓘ
glaciologists ⓘ |
| namedAfter | Charles Lyell ⓘ |
| near | Maclure Glacier ⓘ |
| notableFor |
being Yosemite’s historically largest glacier
ⓘ
rapid 20th and 21st century retreat ⓘ |
| orientation | northeast-facing ⓘ |
| parkUnit | Yosemite Wilderness ⓘ |
| partOf | Lyell Fork of the Tuolumne River watershed ⓘ |
| protectedAreaStatus | within a U.S. national park ⓘ |
| region | central Sierra Nevada ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| status |
disappearing glacier
ⓘ
rapidly retreating ⓘ shrinking ⓘ |
| surfaceAreaTrend | decreasing ⓘ |
| usedFor |
mountaineering access to Mount Lyell
ⓘ
scientific study of glacier retreat ⓘ |
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: Lyell Glacier Description of subject: Lyell Glacier is a rapidly retreating mountain glacier in Yosemite National Park, historically the largest glacier in the park and situated on the slopes of Mount Lyell in the Sierra Nevada of California.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lyell Glacier area