Page 13 - Global Tectonics

xii THE GEOLOGIC TIMESCALE AND STRATIGRAPHIC COLUMN

Era Period Epoch *Ma

Late
260.4
Permian Middle
270.6
Early
299.0
Pennsylvanian
Carboniferous 318.1
Mississippian
359.2
Late
385.3
Devonian Middle
397.5
Early
Paleozoic 416.0
Silurian Late
422.9
Early
443.7
Late
460.9
Ordovician Middle
471.8
Early
488.3
Late
501.0
Cambrian Middle
513.0
Early
542.0
(Eon) (Era)
Late
1000
Proterozoic Middle
1600
Early
Precambrian 2500
Late
2800
Archean Middle
3200
Early
3600
Eoarchean ∼4600

*Age, in millions of years (Ma), based on the timescale of Gradstein et al. (2004)