During the 3 billion years following the impact, the crater has eroded down, and the features now exposed were buried 20 to 25 km (12 to 16 mi) below the surface at the time the event occurred.
More research is needed before the Maniitsoq structure can be definitely confirmed as an impact crater because present diagnostic tools used to identify impacting in the upper crust are inadequate for giant, deeply eroded structures.