Fingerprints of the Clean Up Team:

Nuada's carcass processing facilities were revamped in the mid-19th Century.

Mass graves and hominid hugelkultur enabled agriculture and a new market economy.

Steep-sided conical mounds appeared in 17th Century Britain and America. Most were quickly ploughed under.

In England and in the US barrows and mounds look like earth-covered food bowls.