Large triangle near Port Huron, in Ontario, Canada, Flat black and 400 yards long.

We were camped out on the Ausable river by Arkona, Ontario, Canada, near Port Huron.  We had been digging fossils all day along the river.  We went back to camp around 20:00 and started a fire to cook.  My friend said whats that and pointed to a distant tree line.
There was a huge triangle shaped craft about 1 mile away hovering over the trees and barely moving.  The odd thing was the wide end was in front and there was no sound.  My best guess would be 400 yards long and flat black.  It had no lights.  It moved out of site and we were in awe. It defied the laws of physics.  There is also an air force base close by.  Selfrige I believe is the name.
Date may be approximate, althought the witness does not indicate that fact.  PD