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Some of the rocks cooled from impact melt are quite hard so impact melt could have formed harder formation to lowest part of crater which resisted erosion better leading to outer/higher areas inside crater bowl to erode faster.
Originally posted by deltaboy
What I don't understand is that if the crater in the first pic in the first post is all land, shouldn't it be mostly just a giant lake, not some kind of grassland or mountain whatever its showing.
Originally posted by MrPoporing95
I believe it's called Nastapoka Arc.
The formation may have formed due to an ancient impact crater or glacial unloading. What's weird is how Belcher islands are still standing. If it was a crater, the Belcher islands would no longer be there.