Descriptive Attribute	Value(s)
Stage Description	Substructures and canalization for temple staircases and Lower Temenos Retaining Wall built.
Bottom (m)	Closing depth: Unknown.
Phase Description	Phase IV: Nabataean Grand Design: 1st c. BCE to CE 1st c. The remainder of the subterranean canalization is...
Stage	Stage 1a/1b
Description	Locus 21 is a foundation wall of hewn, limestone (or hard sandstone?) blocks extending under the Retaining Wall (Locus 15). The north faces of the blocks are roughly chiseled and certainly not exposed in antiquity; a gap between this wall and the curbstone (Locus 20) was probably filled with a lead pipe (Locus 13) or other canalization system and covered with capstones, which would obscure the foundation course. Note that this wall also extends under the second stair tread (from the bottom) of Locus 7 and may run into or abut with the west North-South Wall of the Staircase (Locus 6); this relationship is obscured by the lead pipe (Locus 13) and the pedestal of soil underneath and needs to be further explored.
Top (m)	Opening depth: 899.116 m at west; 899.101 m at east.
Definition	Foundation of Retaining Wall (Locus 15).
Phase	IV
Architectural or Soil Locus?	Architectural