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