Two views of a burned basin-shaped feature (Feature 2) in mound 6, unit 46N 2W, part of an area that archaeologists interpret as a metallurgical workshop. The feature has been sectioned to reveal its profile. Viewed from the top, the circular feature consists of a ring of fire-hardened yellowish red (Munsell color 5YR 5/8) sediment. The fire-hardened matrix is thicker at its top edge than it is at the bottom of the basin, where its color is dark red (Munsell 2.5YR 3.6). In profile view (second photo), the basin appears as a narrow band of yellowish red fire-hardened sediment. The fire-hardened sediment is thin and rounded at the base of the basin, suggesting that it may have formed around a round-based vessel used to heat metals. A thermoluminescence sample of the burned matrix yielded a date of 1490 +/- 50 years (Univ. Wash. 2364). Photo scale in cm. Site Ngre Kataa. 23 June 2009.
Looking eastward over excavation unit 48N 10W toward unit 48N 8W in an area (mound 6) that archaeologists interpret as a metallurgical workshop, a series of anvil/grinding stones have been left in place and a burned feature exposed. Foreground, right, a large anvil stone (GS 09-33) rests atop another stone (GS 09-34). To the right (south), the circular rim of an everted-rim jar has been left in place. To the left (north) is a zone of darker ashy soil flecked with charcoal. Center photo is an anvil stone (GS 09-32), against which a partial elephant tusk--now removed--was found resting. Behind this stone is a tree root and base of a tree stump. The area from this stone (GS 09-32) and extending beyond the stump had been covered with artifacts (clusters B-D, now removed) that archaeologists interpret as a large shrine feature. Some of these artifacts were superimposed directly over the amorphous orange-red burned feature (center photo), which was likely created by high heat associated with forging metals. Other smaller stones have been left in place across the unit. Photo scales marked in 5 cm increments, arrows pointing north. Site Ngre Kataa. 4 July 2009.
Triangular-headed iron projectile point (SF 09-033) with a slightly squared base (left ) and a short tang (right). To make an arrow (snini in Nafaanra), the tang was inserted into a straight shaft made of bamboo, reed or lightweight wood to which it was hafted. This artifact was found close to several anvil/grinding stones in an area (mound 6) that archaeologists interpret as a metallurgical workshop. The projectile point shows signs of corrosion by rusting. Scale in cm. Length: 8.1 cm. Weight: 9.3 g. Site Ngre Kataa. 30 May 2009.