"I discovered an potentialy new ~35 Km diameter complex impact crater in the ~1.9 Ga Palaeoproterozoic Inglefield mobile belt (metamorphosed igneous rocks).
The crater morphology clearly seen on the bedmap topography and slightly on the ice surface, than circular shape disturbance.
Possible age is Pleistocene, the ice thickness is ~1700-2000 meter in the area" (Krisztian Klajnik, 2018).