The operation is set on a slope so once we had the interior surface level we switched to locus 2. This also happened to coincide with a moderate shift in the soil matrix to a slightly lighter medium brown sandy silt. The clay content in this layer also appears to be higher suggestive of a surface. Material densities interestingly have moderated as well.
Elevations above from SW corner. Additional elevations:
NW: Top= 1966.62; Bottom=1966.52
NE: Top= 1967.50; Bottom=1967.34
SE: Top=1966.33 ; Bottom=1966.25