While no glaciers currently exist within the park, at least five major Pleistocene glaciations have been identified in Northwest Alaska. The greatest of these glacial events occurred during Illinoisian time when glaciers extended west to the Baldwin Peninsula. The two earlier glaciations, the Kobuk and Ambler glaciations, covered large areas of the Kobuk and Selawik valleys, as well as the drainages of the Baird Mountains. The three later glaciations were restricted to portions of the Schwatka Mountains, east of the park.
Pleistocene|Illinoisian|Kobuk and Ambler glaciations, Pleistocene
Pleistocene|Illinoisian|Kobuk and Ambler glaciations, Pleistocene