Picture of what appears to be a  Platyceras dumosum pileum gastropod fossil. It was found in the Devonian limestone of Jefferson County, ...

This fossil appears to be an Ambonychia clam fossil with both valves. It is has quite a bit of matrix covering detailed parts. The clam ...

Here are some pictures of Michigan's state stone Hexagonaria polished coral (aka Petoskey stone). It was named their state stone in ...