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{{r|Geologic ages of earth history}}

*[[Geologic ages of earth history]]

*[[Geologic ages of earth history]]

{{r|Geologic ages of earth history}}

{{r|Geologic ages of earth history}}

*[[Geologic ages of earth history]]

{{r|Geologic ages of earth history}}

*[[Geologic ages of earth history]]

...f the order geologic events in time based on [[biostratigraphy]] and the [[Geologic ages of earth history|superposition principle]]<ref> confer section on History in Citizendium Geo *[[Geologic ages of earth history]]

...oding) and material sequentially layered through volcanic activity. (see [[Geologic ages of earth history]])

{{r|Geologic ages of earth history}}

*[[Geologic ages of earth history]]

...c ages of earth history|chronostatrigraphic]] system and in the latter a [[Geologic ages of earth history|geochronological]] unit of geological measure. The Cambrian System encompas (''See main article'' [[Geologic ages of earth history]])