Pottery dover with square, incised button, carved decoration, submerged heating floor finding ceramic pottery, molded carved baked sgraffito Dover with square knob with slanted sides Decorated with carvings and wavy edge In the base of the button four cut out triangles Decoration consists of star-shaped cross on the bud and thirteen lines to the edge Red shard on the underside partially yellow discolored by frequent heating Shrinking and drying cracks in the ceramics archeology Rotterdam City center Stadsdriehoek Oostplein underground pit indigenous pottery deaf fireplace kitchen room heating Soil discovery Rotterdam underground pit Oostplein from lower layer 1976.