The critter in the Grand Rapids museum is a mastodon (or rather, was). When my mom was a kid, an extinct form (not sure which) was excavated near Conklin, but I’m not sure where that one ended up. Maybe one of the universities.
We dug up a mastadon in a peat bog in north central IN about 40 years ago. Landowner gave it to Bethel College. Turned out to be a female and a calf when they excavated the rest of the remains.
I kept a femur, a rib and a vertebra.