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gptkbp:instance_of
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gptkb:geological_formation
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gptkbp:bfsLayer
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4
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gptkbp:bfsParent
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gptkb:The_Ocean
gptkb:The_Ocean_Collective
gptkb:Pelagial
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gptkbp:climate
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varied from warm to cool
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gptkbp:duration
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approximately 291 million years
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gptkbp:field_of_study
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gptkb:physicist
Earth Science
Geology
Paleontology
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gptkbp:follows
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Proterozoic
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gptkbp:fossil_record
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gptkb:dinosaur
gptkb:fungus
gptkb:Insects
gptkb:Sharks
gptkb:Plants
gptkb:mythological_figure
gptkb:Brachiopods
gptkb:Ammonoids
gptkb:Eurypterids
Microorganisms
Bivalves
Corals
Gastropods
Cycads
Conifers
Ginkgoes
Lycophytes
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gptkbp:geographical_feature
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marine transgressions
sedimentary rock formation
mountain building events
supercontinent formation
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gptkbp:historical_period
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mass extinction events
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gptkbp:includes
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Carboniferous period
Devonian period
Cambrian period
Silurian period
Permian period
Ordovician period
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gptkbp:is_characterized_by
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diversification of life
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gptkbp:lifespan
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gptkb:dinosaur
gptkb:fish
gptkb:Ammonites
gptkb:Trilobites
Early amphibians
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gptkbp:notable_event
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gptkb:Late_Devonian_extinction
gptkb:Permian-Triassic_extinction_event
Great Ordovician Biodiversification Event
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gptkbp:precedes
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Mesozoic
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