Archean Eon
type: ProperInterval
has beginning: Base of Archean Eon
has end: Base of Proterozoic Eon
interval meets: Proterozoic Eon
interval met by: Hadean Eon

Base of Archean Eon
type: Instant
in time position: Temporal position of Base of Archean Eon

Temporal position of Base of Archean Eon
type: TimePosition
has TRS: ChronometricGeologicTime
numeric position: 4000

Base of Cenozoic Era
type: Instant
in time position: TimePosition
  has TRS: ChronometricGeologicTime
  numeric position: 66.0

Base of Mesozoic Era
type: Instant
in time position: TimePosition
  has TRS: ChronometricGeologicTime
  numeric position: 252.17

Base of Phanerozoic Eon
type: Instant
in time position: TimePosition
  has TRS: ChronometricGeologicTime
  numeric position: 541.0

Base of Proterozoic Eon
type: Instant
in time position: Temporal position of Base of Proterozoic Eon

Temporal position of Base of Proterozoic Eon
type: TimePosition
has TRS: ChronometricGeologicTime
numeric position: 2500

Cambrian Period
type: ProperInterval
has beginning: Base of Phanerozoic Eon

Carboniferous Period
type: ProperInterval
interval met by: Devonian Period

Cenozoic Era
type: ProperInterval
has beginning: Base of Cenozoic Era
has end: The present
interval finished by: Quaternary Period
interval met by: Mesozoic Era
interval started by: Paleogene Period

Cretaceous Period
type: ProperInterval
has end: Base of Cenozoic Era
interval met by: Jurassic Period

Devonian Period
type: ProperInterval
interval met by: Silurian Period

Hadean Eon
type: ProperInterval
has end: Base of Archean Eon

Jurassic Period
type: ProperInterval
interval met by: Triassic Period

Mesozoic Era
type: ProperInterval
has beginning: Base of Mesozoic Era
has end: Base of Cenozoic Era
interval finished by: Cretaceous Period
interval met by: Paleozoic Era
interval started by: Triassic Period

Neogene Period
type: ProperInterval
interval met by: Paleogene Period

Ordovician Period
type: ProperInterval
interval met by: Cambrian Period

Paleogene Period
type: ProperInterval
has beginning: Base of Cenozoic Era
interval met by: Cretaceous Period

Paleozoic Era
type: ProperInterval
has beginning: Base of Phanerozoic Eon
has end: Base of Mesozoic Era
interval finished by: Permian Period
interval started by: Cambrian Period

Permian Period
type: ProperInterval
has end: Base of Mesozoic Era
interval met by: Carboniferous Period

Phanerozoic Eon
type: ProperInterval
has beginning: Base of Phanerozoic Eon
has end: The present
interval finished by: Cenozoic Era
interval met by: Proterozoic Eon
interval started by: Paleozoic Era

The present
type: Instant
in date time: DateTimeDescription
  unit type: unitYear
  year: 1950
in time position: TimePosition
  has TRS: ChronometricGeologicTime
  numeric position: 0.0
in XSD date time stamp: 1950-01-01T00:00:00Z

Proterozoic Eon
type: ProperInterval
has end: Base of Phanerozoic Eon
interval met by: Archean Eon

Quaternary Period
type: ProperInterval
has end: The present
interval met by: Neogene Period

Silurian Period
type: ProperInterval
interval met by: Ordovician Period

Geologic timescale
type: TRS
member: Archean Eon
member: Hadean Eon
member: Phanerozoic Eon
member: Proterozoic Eon

Triassic Period
type: ProperInterval
has beginning: Base of Mesozoic Era
interval met by: Permian Period