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.
Yes, I question that: Canadian Shield just doesn't have magma domes under it, which are typical of subduction zones and great seismic activity.
Rather the opposite in fact: A magma dome (like the unusual southern granite domes at GA's Stone Mountain and TX's Enchanted Rock don't "stay submerged" either - they are revealed as the surrounding softer rock is eroded away, not revealed by the ridges in overlaying rock.