A light-colored slurry plaster marks the outlines of earthen walls exposed through excavations at Mound 7, Ngre Kataa. View looking westward. The T-shaped juncture where two walls intersect is visible (center, top). The interior and exterior of the walls were coated with a thin plaster, appearing as a light-colored thin line exposed by archaeologists as they dug down. A two-meter scale appears (right) by a photo board. To the left and outside the building is a cluster of stones, some perhaps used in food processing activities. Ngre Kataa, 6 June, 2009.