The wall, or intersecting nexus of walls, at the northern end of operation AB3. This built locus perhaps consists of 3 separate constructions at 2 or three different elevations, but it is yet impossible to parse them as different walls before a trench expansion. The highest wall portion enters the trench from the eastern baulk several decimeters south of the northern trench wall and proceeds roughly west towards the trench's northwest corner. This wall sits rather vertically, no tilt, and both its northern and southern faces are exposed in operation AB3 (although the southern face to a lower extent). The lowest extent of this construction is obscured medially by the third portion/construction of locus 4 (see below). At the center of the first construction emerges the proximal end of a likely second wall, perpendicular to the first wall's southern face. It then moves southwest towards the trench's western baulk and out of the operation. A most interesting facing occurs on the eastern side of this second wall right where it intersects with the first construction: a fired clay coating, plaster-like in its possible purpose, but clearly a ceramic material of consistent thickness. This wall is severely inclined, the upper courses lying several decimeters to the south of the lower courses. It was therefore necessary to pedestal the wall on its southern side, making it almost impossible to determine upon what surface the wall sists. This wall obscures the lower reaches of the first wall on the western side of the trench (mediall). The lowest wall also links into the two others at this mid-trench position, directly below the articulation of the first and second constructions, via the same rectangular stone from the second construction which features the ceramic coating. This portion runs approximately west-east into the eastern trench baulk and consists of only two (maximum) courses of rather casually assembled, but certainly faced stones. This portion is also the most southern wall portion, and therefore it is clear that it lies not on bedrock, but upon a semi-burned clay, silt, and pebble layer of construction fill, appxoimately 15 centimeters thick (which itself sits on bedrock).The two higher walls are made of basalt and andesite, while the lowest construction appears to consists solely of andesite.