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gptkbp:instanceOf
|
gptkb:geological_formation
|
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gptkbp:age
|
approximately 66 million years ago
|
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gptkbp:alsoKnownAs
|
gptkb:Cretaceous–Paleogene_boundary
|
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gptkbp:associatedWith
|
gptkb:mass_extinction_event
extinction of non-avian dinosaurs
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|
gptkbp:characterizedBy
|
high iridium concentration
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gptkbp:contains
|
iridium layer
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gptkbp:currentName
|
Cretaceous–Paleogene boundary (K–Pg boundary)
|
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gptkbp:discoveredBy
|
gptkb:Luis_Alvarez
gptkb:Walter_Alvarez
|
|
gptkbp:discoveredIn
|
1980
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|
gptkbp:evidence
|
asteroid impact hypothesis
|
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gptkbp:followedBy
|
gptkb:Paleogene_period
|
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gptkbp:foundIn
|
sedimentary rock layers worldwide
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gptkbp:location
|
gptkb:Gubbio,_Italy
gptkb:Stevns_Klint,_Denmark
gptkb:Hell_Creek_Formation,_USA
|
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gptkbp:marking
|
end of Cretaceous period
beginning of Paleogene period
|
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gptkbp:namedAfter
|
gptkb:Cretaceous_and_Tertiary_periods
|
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gptkbp:precededBy
|
gptkb:Cretaceous_period
|
|
gptkbp:significance
|
marks one of Earth's major mass extinctions
|
|
gptkbp:usedIn
|
geology
paleontology
stratigraphy
|
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gptkbp:bfsParent
|
gptkb:K–Pg_boundary
|
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gptkbp:bfsLayer
|
6
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
K–T boundary
|