This is important because we lock in earliest mound building to a thousand years before the European Bronze Age and copper mining at Lake superior around 2400 BC. What had been bothering me is that pottery making had to follow the miners from Europe. However it di9d not need to become a universally used technology that fast, particularly among hunters who would hardly want to haul a terribly vulnerable artifact around.
Pottery demands settlement and really well developed settlement at that, I suspect.
The evidence described here conforms well to an indigenous development of mound culture and pottery making as a later adoption all of which conforms to an Atlantean trade culture focused on extracting copper for its global markets.