[Robert A Cook PE]

Interesting that the "lake" in the second photo is so vividly marked by concentric (meteor-like) ridges around a central hole.

This whole Canadian Shield area, uncovered so long, and scraped clean only by glaciers but little other erosion and mountain building, is a living testimony to past impacts on the surface.

[cogitator]

This whole Canadian Shield area, uncovered so long, and scraped clean only by glaciers but little other erosion and mountain building, is a living testimony to past impacts on the surface.

The text on the page with that image attributes that geology to a below-surface magma dome emplacement rather than an impact. I was surprised by that; I don't know how "informed" the description is.