St. Louis Limestone
E814327
St. Louis Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its thick, fossil-bearing marine limestones that are important in regional stratigraphy and hydrocarbon exploration.
All labels observed (2)
| Label | Occurrences |
|---|---|
| St. Louis Limestone canonical | 3 |
| St. Louis Limestone (locally) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9643252 — 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: St. Louis Limestone Context triple: [Harrodsburg Limestone, underlies, St. Louis Limestone]
-
A.
Salem Limestone
Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
-
B.
Harrodsburg Limestone
Harrodsburg Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its fossil-rich marine deposits and use as a building stone.
-
C.
Anston limestone
Anston limestone is a durable, fine-grained building stone from Anston in South Yorkshire, England, historically quarried for major 19th-century architectural projects.
-
D.
Mitchell Limestone
Mitchell Limestone is a geologic limestone formation known from the Midwestern United States, recognized for its stratigraphic position and fossil-bearing carbonate rocks.
-
E.
Tura limestone
Tura limestone is a fine white Egyptian limestone historically prized for its high quality and used as the outer casing stone for major monuments such as the Great Pyramid of Giza.
- 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: St. Louis Limestone Target entity description: St. Louis Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its thick, fossil-bearing marine limestones that are important in regional stratigraphy and hydrocarbon exploration.
-
A.
Salem Limestone
Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
-
B.
Harrodsburg Limestone
Harrodsburg Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its fossil-rich marine deposits and use as a building stone.
-
C.
Anston limestone
Anston limestone is a durable, fine-grained building stone from Anston in South Yorkshire, England, historically quarried for major 19th-century architectural projects.
-
D.
Mitchell Limestone
Mitchell Limestone is a geologic limestone formation known from the Midwestern United States, recognized for its stratigraphic position and fossil-bearing carbonate rocks.
-
E.
Tura limestone
Tura limestone is a fine white Egyptian limestone historically prized for its high quality and used as the outer casing stone for major monuments such as the Great Pyramid of Giza.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Mississippian stratigraphic unit
ⓘ
carbonate rock unit ⓘ geologic formation ⓘ |
| ageRange | Middle Mississippian ⓘ |
| bedding | thick-bedded to massive ⓘ |
| color | typically gray to brownish-gray ⓘ |
| contains | chert nodules in some areas ⓘ |
| containsFossils |
brachiopods
ⓘ
bryozoans ⓘ corals ⓘ crinoids ⓘ marine invertebrates ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| depositionalSetting | epicontinental sea ⓘ |
| diageneticFeatures | dolomitization in local zones ⓘ |
| economicImportance |
dimension stone in some localities
ⓘ
hydrocarbon reservoir rock in some basins ⓘ source of crushed stone ⓘ |
| environmentOfDeposition | shallow marine shelf ⓘ |
| foundIn |
Illinois Basin
ⓘ
linked to:
Illinois Basin area
Midcontinent region ⓘ
linked to:
Central United States
|
| geologicAge | Mississippian ⓘ |
| geologicPeriod | Carboniferous ⓘ |
| lithology |
carbonate rock
ⓘ
limestone ⓘ |
| namedFor |
St. Louis, Missouri
ⓘ
linked to:
St. Louis, Missouri, United States
|
| notableFeature |
prominent fossil content
ⓘ
thick marine limestone beds ⓘ |
| overlies |
Salem Limestone
ⓘ
Spergen Limestone ⓘ
linked to:
Mitchell Limestone
|
| partOf | Carboniferous stratigraphy of North America ⓘ |
| porosityType | intergranular and fracture porosity in reservoir intervals ⓘ |
| primaryLithology | marine limestone ⓘ |
| recognizedIn |
Illinois
ⓘ
Indiana ⓘ Kentucky ⓘ Missouri ⓘ |
| region | central United States ⓘ |
| roleIn | regional stratigraphic correlation in the central United States ⓘ |
| stratigraphicUnitOf |
Mississippian System
ⓘ
linked to:
Mississippian Series
|
| studiedIn |
paleontology
ⓘ
petroleum geology ⓘ stratigraphy ⓘ |
| texture | fine- to medium-grained limestone ⓘ |
| underlies |
Chesterian formations in some areas
ⓘ
Ste. Genevieve Limestone ⓘ |
| usedFor |
construction aggregate
ⓘ
industrial limestone ⓘ |
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: St. Louis Limestone Description of subject: St. Louis Limestone is a Mississippian-age carbonate rock formation in the central United States, notable for its thick, fossil-bearing marine limestones that are important in regional stratigraphy and hydrocarbon exploration.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.