Proving that Marsal Lake is an impact crater will require ... in our understanding of Earth’s geological history — and all thanks to a casual glance at Google Maps.

For one camper, a quick browse on Google Maps ... Marsal Lake could join the ranks of nearly 200 impact craters worldwide, 31 of which are in Canada . Earth sciences professor at Western ...

There appeared to be a 15km wide circle surrounding Marsal Lake. Intrigued by the shape ... “It’s quite easy with Google Earth to find structures that are circular or semi-circular in origin.