Debris and a roughed-out block in a quarry on Marmara Adası (ancient Prokonnesos).
Quarrying activity on Marmara Adası (ancient Prokonnesos) began in the Classical period, if not earlier, and continued through the Byzantine and Ottoman period up to the present day. The peak period of quarrying on the island prior to the modern period was the Roman period, however. Prokonnesian marble is white with fine, sometimes thicker, grey veins. Large quantities of roughed-out material were recovered during the clearance of ancient debris piles as part of modern activity.