Mazon Creek fossil beds

E874069

Lagerstätte fossil site

Mazon Creek fossil beds are a renowned Pennsylvanian-age Lagerstätte in Illinois famous for exceptionally well-preserved soft-bodied plants and animals within ironstone concretions.

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All labels observed (6)

Label	Occurrences
Mazon Creek fossil beds canonical	2
Mazon Creek (in fossil context)	1
Mazon Creek Fossil Beds State Natural Area	1
Mazon Creek Lagerstätte	1
Mazon Creek area	1
Mazon Creek beds	1

How this entity was disambiguated

This entity first appeared as the object of triple T10601366 — 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: Mazon Creek fossil beds
Context triple: [Mazon River, hasFossilLocality, Mazon Creek fossil beds]

A. Cleveland-Lloyd Dinosaur Quarry
The Cleveland-Lloyd Dinosaur Quarry is a famous Jurassic fossil site in Utah known for its exceptionally dense concentration of dinosaur bones, particularly those of Allosaurus.
B. Fossil Park
Fossil Park is a public attraction in Sylvania, Ohio, known for its accessible fossil beds where visitors can search for and collect prehistoric marine fossils.
C. Florissant Fossil Beds National Monument
Florissant Fossil Beds National Monument is a protected area in central Colorado renowned for its exceptionally well-preserved Eocene-era plant and insect fossils, including large petrified redwood stumps.
D. John Day Fossil Beds National Monument
John Day Fossil Beds National Monument is a U.S. National Park Service site in Oregon renowned for its well-preserved fossil beds that document over 40 million years of plant and animal evolution.
E. Rhynie Chert fossil locality
The Rhynie Chert fossil locality is a famous Early Devonian site in Scotland renowned for its exceptionally preserved early land plants, arthropods, and microorganisms that provide key insights into the evolution of terrestrial ecosystems.
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: Mazon Creek fossil beds
Target entity description: Mazon Creek fossil beds are a renowned Pennsylvanian-age Lagerstätte in Illinois famous for exceptionally well-preserved soft-bodied plants and animals within ironstone concretions.

A. Cleveland-Lloyd Dinosaur Quarry
The Cleveland-Lloyd Dinosaur Quarry is a famous Jurassic fossil site in Utah known for its exceptionally dense concentration of dinosaur bones, particularly those of Allosaurus.
B. Fossil Park
Fossil Park is a public attraction in Sylvania, Ohio, known for its accessible fossil beds where visitors can search for and collect prehistoric marine fossils.
C. Florissant Fossil Beds National Monument
Florissant Fossil Beds National Monument is a protected area in central Colorado renowned for its exceptionally well-preserved Eocene-era plant and insect fossils, including large petrified redwood stumps.
D. John Day Fossil Beds National Monument
John Day Fossil Beds National Monument is a U.S. National Park Service site in Oregon renowned for its well-preserved fossil beds that document over 40 million years of plant and animal evolution.
E. Rhynie Chert fossil locality
The Rhynie Chert fossil locality is a famous Early Devonian site in Scotland renowned for its exceptionally preserved early land plants, arthropods, and microorganisms that provide key insights into the evolution of terrestrial ecosystems.
F. None of above. chosen

Statements (62)

Predicate	Object
instanceOf	Lagerstätte ⓘ fossil site ⓘ
associatedWithIndustry	coal mining ⓘ
containsFossil	Acanthodes spp. ⓘ linked to: Acanthodes Amphibians ⓘ Arachnids ⓘ Bivalves ⓘ Calamites ⓘ Cnidarians ⓘ Crustaceans ⓘ Early reptiles ⓘ Esconichthys apopyris ⓘ Eurypterids ⓘ Ferns ⓘ Fossil jellyfish ⓘ Gastropods ⓘ Horseshoe crabs ⓘ Insect fossils ⓘ Lepidodendron ⓘ Lycopsids ⓘ linked to: Lycopodiophyta Millipedes ⓘ Nematodes ⓘ Palaeonisciform fishes ⓘ Polychaete worms ⓘ Seed ferns (pteridosperms) ⓘ Sigillaria ⓘ Sphenopsids ⓘ Tullimonstrum gregarium ⓘ
country	United States ⓘ linked to: United States of America
discoveredIn	mid-19th century ⓘ
environmentOfDeposition	coastal plain ⓘ deltaic ⓘ estuarine ⓘ
geologicAge	Pennsylvanian ⓘ late Carboniferous ⓘ
geologicalTimeSpan	approximately 307–309 million years ago ⓘ
hasProtectionStatus	partly protected as state park areas ⓘ
hasTypeLocality	Mazon River ⓘ
knownFor	diverse Pennsylvanian biota ⓘ exceptional soft-tissue preservation ⓘ exceptionally preserved animals ⓘ exceptionally preserved plants ⓘ soft-bodied fossil preservation ⓘ
lithology	ironstone ⓘ sideritic mudstone concretions ⓘ
locatedIn	Grundy County, Illinois ⓘ Illinois ⓘ Will County, Illinois ⓘ
locatedOnGeologicUnit	Carboniferous period ⓘ Pennsylvanian subperiod ⓘ
namedAfter	Mazon Creek ⓘ
overlies	Joliet Sandstone ⓘ
partOf	Illinois Basin ⓘ linked to: Illinois Basin area Mazon Creek depositional basin ⓘ linked to: Carbondale Formation
preservationType	concretionary preservation ⓘ ironstone concretions ⓘ
recognizedAs	one of the most important Carboniferous Lagerstätten ⓘ
researchField	paleobotany ⓘ paleoecology ⓘ paleontology ⓘ
stratigraphicUnit	Carbondale Formation ⓘ Francis Creek Shale ⓘ

How these facts were elicited