Sentence:  The dry quarry in Shrewsbury [was] in use from at least 1445-6 [...until] 1568-9 (and perhaps beyond)[. ...] Location of this as the site of a semicircular <WSD>amphitheatre</WSD> [used in the 1400s and 1500s] is confirmed by the evidence, published in total for the first time in the present volume. 
Meaning of the word marked with <WSD> tags:  An open, outdoor theatre (which may be a theatre in the round, or have a stage with seating on only one side), especially one from the classical period of ancient Greece or Rome, or a modern venue of similar design.