Insitu anvil/grinding stones in excavation unit 50N 6W in an area (mound 6) that archaeologists interpret as a metallurgical workshop. Left of center photo, a large anvil stone (GS 09-15) sits next to a small stone, its lower surface worn flat by serving as a hand-held grinder. Behind this stone is an area of unexcavated soil on top of which pottery sherds had been found (now removed). Lower foreground, flanked by the black-and-white photo scale, is the partial rim of an everted-rim jar (NK 09-749). To the north of this (right), a large flat grinding stone with a well-worn upper surface (GS 09-12) has been pedestaled in place. Visible in the southern corner of the west wall of the unit (upper left) in this photo is a flat iron disk (SF 09-159), embedded in the wall above a small stone. Photo scales marked in 5 cm increments. Arrows pointing north. Site Ngre Kataa. 6 June 2009.