The ending sounds a bit like 'Gann', a short audio clip from Boards of Canada's former interactive website.
The Ataronchronon were a tribal people living in 17th century Ontario. Also known as the "People of the Marshes", they were considered a tribe of the Huron Indians, who were further part of the larger Iroquoi family.
The entire track is a near-perfect musical palindrome, meaning the track sounds similar when played both forwards and backwards.