I once drove through an area in southern Ontario called the Sudbury. There was apparently a major very old boloid strike here, and the area has been extensively mined for a number of minerals. No enviros here, it is one of the ugliest stretches of earth I have ever seen. Miles and miles of desolation and toxic poisoning of any plant life.
The Sudbury ring is an impact structure. Uncharacteristically, I took a quick look where there might be a file about it, and the hard drive had *nothing*. I’m a little shocked. ;’) In fact, I don’t remember seeing anything about the Manicougan lakes / crater either. I did have a folder regarding the Haughton Astrobleme (my personal favorite name for an Earthly impact structure). :’)
Did the boloids ever go back to work or did stay they on strike?