Ingeology, astratotype ortype section is thephysical location oroutcrop of a particular reference exposure of astratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is thetype locality.[1]
Also it can be defined as "The particular sequence of strata chosen as standard of reference of a layered stratigraphic unit."[This quote needs a citation]
When a stratigraphic unit is nowhere fully exposed, the original type section may be supplemented withreference 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 a type section according to more modern standards.[2]
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