In September 2021 I visited the Besser Museum at Alpena, Michigan, USA. They had a large exhibit on Native American artifacts found in Mic...

Here is an image of a polished Prismatophyllum rugose coral fossil (Petosky Stone). It existed in the Devonian Period (410-360 million ye...

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