Shell gorget (or preform)

[joshuaream]

Here is a big piece of shell from Michigan. I'm not quite sure what this would have been, it looks like a Glacial Kame Sandal Sole gorget preform but the material is wrong... I believe 100% of all the known and authentic Sandal Soles are made from Whelk shell, while this is Conch. Not drilled and not polished, but covered with enough patina to scare a fake gorget to death.

It looks like it was buried next to some copper for a while.

[Tnmountains]

Maybe a death mask?

[Airborne80]

May be the sole of a prehistoric tennis shoe