A BOOK often cited here on FR includes a lot of detail tying the bays to an impactor "up north". Lots of technical stuff included that may a bit hard to follow for the layman; like me.
I’ve been studying it, kind of casually on and off for a few years.
At first, I thought the impact site was a bit to the west of Lake Superior, the object coming in from the NW, on a NW-SE trajectory.
Hitting the ice sheet, miles thick, therefore leaving no “crater” in the surface rock.
But these guys make a very convincing argument for Saginaw. Add to that that it matches what we see here, which are fields of crushed and intermixed bones in Mexico.
Whether they got struck by debris is immaterial. The shockwave alone would have pulverized them.