= Stage (stratigraphy)
{wiki=Stage_(stratigraphy)}
In stratigraphy, "Stage" refers to a specific unit of geological time and sedimentary rock characterized by a distinct set of strata that can be recognized and correlated across different regions. It is a subdivision of a geological period and is defined by the types and ages of the rock layers, which often represent particular intervals of geological time associated with the deposition of sediments, changes in environments, or significant biological events (such as mass extinctions or the emergence of different types of flora and fauna).
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