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Geological Time Scale

EonEraPeriodExtent, Million
Years Ago
Duration, Millions
of Years
PhanerozoicCenozoicQuaternary (Pleistocene/Holocene)2.588–02.588+
Neogene (Miocene/Pliocene)23.03–2.58820.4
Paleogene (Paleocene/Eocene/Oligocene)66.0–23.0342.9
MesozoicCretaceous145.5–66.079.5
Jurassic201.3–145.056.3
Triassic252.17–201.350.9
PaleozoicPermian298.9–252.1746.7
Carboniferous (Mississippian/Pennsylvanian)358.9–298.960
Devonian419.2–358.960.3
Silurian443.4–419.224.2
Ordovician485.4–443.442
Cambrian541.0–485.455.6
ProterozoicNeoproterozoicEdiacaran635.0–541.094
Cryogenian850–635215
Tonian1000–850150
MesoproterozoicStenian1200–1000200
Ectasian1400–1200200
Calymmian1600–1400200
PaleoproterozoicStatherian1800–1600200
Orosirian2050–1800250
Rhyacian2300–2050250
Siderian2500–2300200
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