Pre Cambrian Revisions (Stratigraphy)

Base Ediacaran System 635mya

The principal observed correlation events are (1) the rapid decay of Marinoan ice sheets and onset of distinct cap carbonates throughout the world, and (2) the beginning of a distinctive pattern of secular changes in carbon isotopes.

Pre-Cambrian eras and systems below Ediacaran are defined by absolute ages, rather than stratigraphic points.



Hadean Eon ~4600 informal term formation of planet earth
Archaean Eon
Eo ~4000 oldest preserved rocks on earth's surface
Paleo 3600
Meso 3200
Neo 2800
Proterozoic Eon
Paleoproterozoic Era
Siderian System 2500
Rhyacian System 2300
Orosirian System 2050
Stratherian System 1800
Mesoproterozoic Era
Calymmian System 1600
Ectasian System 1400
Stenian System 1200
Neoproterozoic Era
Tonian System 1000
Cryogenian System 850
base Ediacaran System 635