Descriptive Attribute	Value(s)
Bonds to	Loci 25, 26 and 27.
Combined with	Loci 3, 12 and 24.
Top (m)	Opening elevation: 905.372 m.
Stage	Stage 3
Description	Locus 18 is the exposed hewn bedrock plateau in the precinct southwest. The surface of the bedrock is moderately level and contains a series of deep quarrying cuts arranged in a loose grid. The cuts measure approximately 0.15 m in width and are positioned roughly 1.10 m apart. The depth of the cuts ranges from 0.08 m to 0.27 m and the overall difference in elevation across the plateau is 0.18 m. Locus 18 has been assigned to this stage because the quarrying and leveling of the bedrock postdates the construction and use of the caves, and predates the construction of architectural superstructure in this area.
Definition	Bedrock plateau
Abuts	Loci 7 and 8.
Phase	I
Overlies	None.
Underlies	Locus 28.
Location	In the central area of the West Plaza south.
Bottom (m)	Closing elevation: 905.192 m.
Size	6.50 m north south-by-6.40 m east west.
Preserved Height	Not applicable.
Stage Description	Quarrying of the bedrock and leveling of the temple southwest.
Phase Description	Phase I: Preparation: 1st c. BCE quarrying and leveling of the bedrock beneath the Upper Temenos. Some...
Architectural or Soil Locus?	Architectural