sentences:  Historians have reported that during this period, there were more masons working in Sydney than the whole of Europe.It was estimated that by 1928 total production of dressed sandstone from Pyrmont was more than half a million cubic yards (about 460,000 cubic metres) and much was carted away to build other places.The main public buildings in Sydney, completed from the 1850s until the 20th century were built in sandstone from Pyrmont where some 50 quarries operated.