Are stratotype and stratigraphic unit, similar?

Stratotypes and Type Localities (Definitions) a Derinitions: Named stratigraphic units must be defined or characterized at a specified locality where they are well exposed and developed in order that there will be a common, materia standard of reference for their identification. Dafar aDAalk Caatian: Tho articular seauence of strata chosen aS a standard reference of identification.