Locus 15 represents the continuation of the floor of locus 11 (controlling for shifts in material densities). The matrix is a packed clay with specs of charcoal. The locus is defined by the probe of locus 14 to the north and the large boulder (fall) to the south. Top elevation is 1.35 b.d. 1 and bottom elevation is 1.41 b.d. 1.