Could be caldera - A caldera is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption.
Unless the geology says positively no vulcanism!
Also, it would be good to get some samples and see if they show impact stress before concluding they were from meteorites.
The craters are the top of granite mountains. The glaciers would have wiped volcanoes down smooth. These got shaped edges blasted right into the granite.
My cousin is a geologist.
He told me they were parts of a comet because they are close together not many many miles apart except the other group.