This is a geological layer but was not used as fill. Instead, wall 22002 was built into this deposit, which is almost empty of anthropic materials (a couple small bits of pottery are most likely intrusive from the earthen floor 22013 above).

A geologic layer of pebbles and gravel used to fill the room before the start of the intentional dumping that occurred in 22012 in the late 1st century BCE to early 1st century CE. -EAV