No no no. You've got to interpolate incompetent reporting.
This "dump" is apparently a cut and cover operation, where pits are dug, garbage spread and compacted, and then filled with thin layes of original soil.
Digging the large pits to begin the process is where the skull and other artifacts were discovered.
Sort of like randomly picking a spot do dig a large deep hole, and discovering unexpected prizes.
;)
Thank you.
I was thinking 'dump' in terms of excavating at an ancient midden site.