 Imported chaff, straw, barley grain, charcoal and midden material were used for animal fodder, as temper for the making of wall plaster and mud-brick, and for fuel for the ovens and fires.At the Quarries, several columns, some basins and a bath can still be found lying broken; the largest column is 60 ft high and weighs some 200 tonnes.Many buildings still survive intact to roof height.