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A stratotype or type section is a geological term that names the physical location or outcrop of a particular reference exposure of a stratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality.[1]

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  1. ^ "Stratotypes and Type Localities". International Commission on Stratigraphy. Retrieved 20 August 2017.