This locus designates the area under Locus 4, in the area of the doorway in the partition wall of WSAD. The matrix is still the dark, loamy soil of the overburden with a lot of roots. The extent of the locus is delimited by several larger stones of the blocked doorway (three of which were broken 7/28/10). Locus was extended 7/29/10 after removing more rocks and soil; see notebook for final sketch.