Image 3a & 3b: Excavating using a precise grid system, you slowly find walls and outline rooms. Then you remove the fill in the room in layers, carefully screening the dirt so as not to miss small artifacts. Unfortunately, much of each room has been looted, which mixes the artifacts. Finally, there’s the reward: the excavation of the floor and its features such as hearths and pits. You are not actually done after excavating, mapping, and photographing the rooms: the area below the room is excavated to look for evidence of earlier occupation.