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Geological formation
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Fundamental unit of lithostratigraphy
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Wikipedia

A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of...

Subclass of
lithostratigraphic unit
Subject
Stratigraphy
References
Wikidata