[Yosemitest]

You might want to look at the Oblique Impact Crater on Mars with ejecta butterfly.

Look at the overlay of that crater on the Saginaw Region.

[txhurl]

bttt

[Robert A Cook PE]

Interesting idea.

Rotate your oblique impact crater and spall pattern slightly counterclockwise - so that the impact crater is a little in line with the Michigan peninsula. As if the Michigan peninsula is the “rebound” or central raised area sometimes (not always!) seen within the impact crater walls themselves/.

Sudberry nickel deposits next door? Another impact?