What i have finally understood is that the folk who maintained these documents were actually the tribe of metal workers. That makes their presence near Lake Superior natural and certain and their ultimate move to essentially the tin mines of Cornwall also natural.
Steady decline in demand for copper ultimately forced their moves although we are certainly looking at a temporal arc that is at least two thousand years or those ninety generations. What is unexpected is that they hung on in North America long past the Atlantean collapse likely trading with local tribes. Most mines would have been abandoned but it needs little to sustain a modest locale trade.
Their final move likely was triggered by contact with the Vikings through Hudson Bay and their introduction to iron working. They then surely moved the entire community to Cornwall to have access to ample tin and to pursue perhaps an ongoing copper trade...
Deal with them in such a way that their fate will be an example restraining others fi-om doing likewise. Never join cause with anyone proved treacherous or unreliable.
I, Efantiglan, and my father, attended to the making of these books and their covering containers.
Those who mixed the metal and worked it by forging and those who cut upon it are members of our tribe, and it is well made and will last forever.