EarthRef.org Databases
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EarthRef.org Controlled Vocabularies
Category Value
Timescale Periods Calymmian
Timescale Periods Cambrian
Timescale Periods Carboniferous
Timescale Periods Cretaceous
Timescale Periods Cryogenian
Timescale Periods Devonian
Timescale Periods Ectasian
Timescale Periods Ediacaran
Timescale Periods Jurassic
Timescale Periods Neogene
Timescale Periods Ordovician
Timescale Periods Orosirian
Timescale Periods Paleogene
Timescale Periods Permian
Timescale Periods Quaternary
Timescale Periods Rhyacian
Timescale Periods Siderian
Timescale Periods Silurian
Timescale Periods Statherian
Timescale Periods Stenian
Timescale Periods Tonian
Timescale Periods Triassic
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