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A stratotype/type section in geology is 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.

Also it can be, defined as "The particular sequence of strata chosen as standard of reference of a layered stratigraphic unit."

When a stratigraphic unit is nowhere fully exposed, the original type section may be supplemented with reference sections covering the full thickness of the unit. A reference section may also be defined when the original type section is poorly exposed. Or for historical units which were designated without specifying type section according——to more modern standards.

See also※

• Global Boundary Stratotype Section and Point

References※

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