Red earthenware reinforcement, triangular with round head and hole, net reinforcement weighting soil finding ceramic earthenware, hole, hand-formed baked Hand-formed tapered earthenware with round hole. Glaze specks Two pieces with shrinkage cracks occur during the drying of the earthenware archeology underground pit Rotterdam City Triangle Groenendaal indigenous pottery catch fish fisherman seine stone Soil discovery around large cesspool underground pit Groenendaal at approximately 60 meters approximately 2,5 meters - N..P September 15, 1975.