Kimmeridgian stage

E917045

geologic time division stage

The Kimmeridgian stage is a division of the Late Jurassic period characterized by widespread marine sedimentation and important fossil-bearing strata used for global geological correlation.

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All labels observed (2)

Label	Occurrences
Kimmeridgian	8
Kimmeridgian stage canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T11305090 — 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: Kimmeridgian stage
Context triple: [Kimmeridge, givesNameTo, Kimmeridgian stage]

A. Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
B. Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
C. Ludfordian Age
The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
D. Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
E. Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
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: Kimmeridgian stage
Target entity description: The Kimmeridgian stage is a division of the Late Jurassic period characterized by widespread marine sedimentation and important fossil-bearing strata used for global geological correlation.

A. Tithonian
The Tithonian is the final age of the Late Jurassic period, marked by diverse marine life and significant evolutionary developments among dinosaurs and other vertebrates.
B. Toarcian
The Toarcian is a stage of the Early Jurassic period characterized by significant marine life diversification and notable oceanic anoxic events.
C. Ludfordian Age
The Ludfordian Age is a late Silurian time interval characterized by significant marine biodiversity changes and notable graptolite and conodont fossil assemblages.
D. Hettangian stage
The Hettangian stage is the earliest age of the Jurassic Period, marking the beginning of the Mesozoic era’s Jurassic system in the geologic time scale.
E. Pliensbachian
The Pliensbachian is a stage of the Early Jurassic period characterized by distinctive marine faunas and important ammonite biostratigraphy.
F. None of above. chosen

Statements (44)

Predicate	Object
instanceOf	geologic time division ⓘ stage ⓘ
characterizedBy	black shales in some marine basins ⓘ extensive carbonate sedimentation in many basins ⓘ important fossil-bearing strata ⓘ widespread marine sedimentation ⓘ
chronologicalPosition	late phase of the Jurassic period ⓘ
contains	important ammonite biozones ⓘ important invertebrate fossils ⓘ important marine reptile fossils ⓘ
correlatesWith	Upper Jurassic marine strata worldwide ⓘ
definedBy	International Commission on Stratigraphy NERFINISHED ⓘ
economicImportance	source rocks for hydrocarbons in some basins ⓘ
endTime	approximately 152.1 million years ago ⓘ
environment	predominantly marine ⓘ
follows	Oxfordian stage NERFINISHED ⓘ
fossilContent	abundant ammonites ⓘ bivalves ⓘ marine reptiles ⓘ microfossils such as foraminifera ⓘ
geochronologicEquivalent	Kimmeridgian age ⓘ
lithostratigraphicUnitExample	Kimmeridge Clay Formation NERFINISHED ⓘ
namedAfter	Kimmeridge NERFINISHED ⓘ village of Kimmeridge in Dorset, England ⓘ
overlies	Oxfordian stage strata ⓘ
paleogeography	associated with high sea levels in many regions ⓘ
partOf	Jurassic period NERFINISHED ⓘ Late Jurassic NERFINISHED ⓘ Upper Jurassic series ⓘ
positionInJurassic	second stage of the Late Jurassic ⓘ
precedes	Tithonian stage NERFINISHED ⓘ
rank	stage ⓘ
recognizedBy	International Chronostratigraphic Chart NERFINISHED ⓘ
startTime	approximately 157.3 million years ago ⓘ
stratotypeLocatedIn	Dorset, England NERFINISHED ⓘ Kimmeridge Bay NERFINISHED ⓘ
subdividedInto	Lower Kimmeridgian ⓘ Upper Kimmeridgian ⓘ
timeSpan	about 5.2 million years ⓘ
underlies	Tithonian stage strata ⓘ
usedFor	global geological correlation ⓘ
usedIn	biostratigraphy ⓘ chronostratigraphy ⓘ sequence stratigraphy ⓘ

How these facts were elicited