A deeply worn grinding stone (grindstone 1, NK-08-112) removed from levels 1-2, unit 44N 4W, Mound 6, Ngre Kataa, photographed at the side of the excavation unit. The grinding stone was found in association with other grinding stones, tuyere fragments and whole and partial pots. When found, the grinding stone was oriented with its working surface facing downward. It was located adjacent to a concentration of dark soil (feature 1) that contained abundant oxidized sediment, slag and broken pottery. Archaeologists interpret the features at Mound 6 as facilities used to make and process metals. Photo scale in 5 centimeter increments. Ngre Kataa, 2 July, 2008.
The circular outline of a burned basin (Feature 3) is bracketed by photo scales (center) in unit 50N 4W (130 cm below the unit datum) at Mound 6. A pottery jar sits to the right side of the basin, its opening covered by a potsherd lid. To the left, a grinding stone sits, grinding surface down, over top of another pottery jar. Burned features like these were associated with metal working in this Mound 6 workshop area. Photo scale at bottom in centimeters. Site Ngre Kataa. 29 June, 2009.
The circular outline of a burned basin (Feature 3) is bracketed by photo scales (left of center) in unit 50N 4W (130 cm below the unit datum) at Mound 6. A pottery jar sits to the right side of the basin, its opening covered by a potsherd lid. To the left, a grinding stone sits, grinding surface down, over top of another pottery jar. Another grinding stone (far left) sits at a higher level in unit 50N 6W. A second burned feature is associated with a grinding stone tipped on its side, far right. Another pottery jar sits nearby, also lidded with a broken sherd. Burned features like these were associated with metal working in this Mound 6 workshop area. Photo scale at bottom in centimeters. Site Ngre Kataa. 29 June, 2009.
A perforated pottery jar lidded with the pedestaled base of another pot sits in situ at the base of level 6, unit 46N 2W at Mound 6. The pot contained eight cowries and is interpreted by archaeologists as a shrine pot placed in association with metalworking facilities. Photo scale in 5 cm increments. Site Ngre Kataa. 24 June, 2009.
The mouth of a perforated shrine pot (left) is covered with the pedestaled base of another pot. It remains in situ as the surrounding areas of unit 46N 2W are excavated to lower levels. Behind, the stratified layers of Mound 6 are visible in the unit's north wall. Center (back) are a series of anvil and grinding stones exposed at higher mound levels in other excavation units. During excavations in 2008, a cluster of four anvil/grinding stones was found at a level slightly higher than but adjacent (left/west) to the perforated pot. At right, in lower levels, two grinding stones rest at an angle in association with a burned feature. Archaeologists interpret Mound 6 as a metallurgical workshop at which stratified levels built up through repeated use of the same location. Photo scale in centimeters. Site Ngre Kataa. 2 July, 2009.
Iron slag is formed as a byproduct of iron smelting. Here a large slag nodule has broken in half, revealing its interior texture. At the archaeological site of Ngre Kataa, large chunks of 'bubbly' slag like this were occasionally found in household and other contexts, away from areas otherwise associated with metal-working activities. Potters at the time of the site's occupation had begun to use crushed iron slag as a tempering agent in their potting clays, which may explain why large nodules were being carried and cached in areas away from metal-working locations. Ngre Kataa, June, 2008.
View across open excavations in an area (mound 6) that archaeologists interpret as a metallurgical workshop. The photo centers on units 46N 8W (foreground) and the southern half of 48N 8W, the north wall of which (at 47N) can be seen behind the sign board. The exposed areas were excavated in 2008 and the photo taken in preparation for 2009 excavations. Traces of circular burned features, red-orange and yellow in color, can be seen in the freshly scraped surface of these units. The uppermost north arrow sits to the right (east) of the circular outline of a still-buried everted-rim jar. Another everted-jar rim can be seen exposed in the north wall at 47N. This rim and associated artifacts formed cluster B, part of a larger shrine feature (clusters A-D) that extended across the northern half of unit 48N 8W (beneath and behind the small tree trunk visible above and left of the sign board). Cluster A (unit 46N 8W) comprised a large pottery bowl surrounded by six iron bangles that was removed in 2008. It was positioned above and slightly west (left) of the burned feature (center photo) that is intersected by a tree root. Cluster B included the artifacts seen here in the north wall at 47N, together with an associated cluster of a pedestal-handled pot lid, dog skull and jaw bones revealed by further excavation beneath and west (left) of the tree stump. In the upper right of the photo (north and east), insitu anvil (GS 09-15, left) and grinding (GS 09-12, right) stones are visible in unit 50N 6W. Photo scales marked in 5 cm increments and measuring tape marks 2 m. Arrows pointing north. Site Ngre Kataa. 6 June 2009.
Insitu anvil/grinding stones in excavation unit 50N 6W in an area (mound 6) that archaeologists interpret as a metallurgical workshop. A large anvil stone (GS 09-15, foreground, left) sits next to a small stone, its lower surface worn flat by serving as a hand-held grinder. A large tree root is visible to the west of the stone, behind which is an area of unexcavated soil on top of which pottery sherds had been found (now removed). To the east and 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, a large flat grinding stone (GS 09-12) has been pedestaled in place. Photo scales marked in 5 cm increments. Arrows pointing north. Site Ngre Kataa. 6 June 2009.
Rights:
Creative Commons Attribution-NonCommercial
Publisher:
University of Victoria Libraries
Provenance:
Ngre Kataa, Mound 6, Unit 50N 6W, Level 4
Date:
2009-06-06
Location(s) Facet:
Ngre Kataa
Subjects:
Anvil stone; Grinding stone
Subjects Facet:
Excavations (Archaeology); Pottery; Metalworking; Iron
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.
Rights:
Creative Commons Attribution-NonCommercial
Publisher:
University of Victoria Libraries
Provenance:
Ngre Kataa, Mound 6, Unit 50N 6W, Level 4
Date:
2009-06-06
Location(s) Facet:
Ngre Kataa
Subjects:
Anvil stone; Grinding stone
Subjects Facet:
Excavations (Archaeology); Pottery; Metalworking; Iron
Two views of insitu anvil/grinding stones in excavation unit 50N 6W, part of an area (mound 6) that archaeologists interpret as a metallurgical workshop. In the photo looking northward (arrows point north), a large anvil stone (GS 09-15, foreground, left) sits next to a small stone, its lower surface worn flat by serving as a hand-held grinder. A large tree root is visible to the west of the stone, behind which is an area of unexcavated soil on top of which pottery sherds had been found (now removed). To the east and 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, a large flat grinding stone (GS 09-12) has been pedestaled in place. In the view looking west, the well-worn upper surface of this narrow stone can be seen. Visible in the southern corner of the west wall of the unit (upper left) in this photo is a flat iron disc (SF 09-159), embedded in the wall above a small stone. Further excavation showed that this disc was part of an object cluster that included a tri-looped iron bangle and interpreted as part of a shrine. Photo scales marked in 5 cm increments. Arrows pointing north. Site Ngre Kataa. 6 June 2009.