Descriptive Attribute	Value(s)
Phase Description	Phase IV: Nabataean Grand Design: 1st c. BCE to CE 1st c. The remainder of the subterranean canalization is...
Stage	Stage 2
Top (m)	Opening depth: 900.156 m at north; 902.925 m at center; 908.792 m at south.
Definition	East Stairway Wall (equals Locus 15).
Stage Description	Construction of the West Staircase and Lower Temenos Retaining wall.
Description	Locus 4 is a sandstone, north-south, east stairway wall, the counterpart of Locus 6, which forms the east boundary of the staircase complex. It is not as badly weathered as Locus 6 (perhaps it was not exposed to the elements as long?) and is preserved to perhaps 6 m above the Hexagonal Pavement (Locus 18). It is also better understood because it bonds with (and essentially equals) Locus 15, the East-West Retaining Wall and the sub-structures of Locus 15 (namely, the foundation wall, Locus 21).
Phase	IV
Bottom (m)	Closing depth: 899.116 m at north; unknown at center and south.
Architectural or Soil Locus?	Architectural