Before revision: Glacial floods in North America ( 8 ,000 to 15 ,000 years ago) In North America, during glacial maximum, there were no Great Lakes as we know them, but "proglacial" (ice-frontage) lakes formed and shifted.
After revision: Glacial floods in North America ( 15 ,000 to 8 ,000 years ago) In North America, during glacial maximum, there were no Great Lakes as we know them, but "proglacial" (ice-frontage) lakes formed and shifted.