Relative dating methods in anthropology Sex web chat room 4
Dating material drawn from the archaeological record can be made by a direct study of an artifact, or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence relative to datable contexts.
Dating is carried out mainly post excavation, but to support good practice, some preliminary dating work called "spot dating" is usually run in tandem with excavation.
In other words, they may no longer be in their primary context.
But this method is also useful in many other disciplines.That means that the play was without fail written after (in Latin, post) 1587.