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Collection Tier:
Tier 3

Rocks and Minerals ➔ Petoskey Stone

A Petoskey stone is a rock with fossilized rugose coral (Hexagonaria percarinata). These corals lived in Michigan during the Devonian time period (between 419-358 million years ago). During this time, warm shallow seas covered much of the state. Petoskey stones can often be found in the northern region of Michigan's lower peninsula and in 1965, they were named Michigan's state stone. 



Current Location Status:
Education Program

Discovery Kit: Fossils (October 25 2019)
Discovery Kits include a variety of artifacts and specimens from the Museum’s Collection that allow students to investigate global and local objects. The Collections support the Museum’s mission of inspiring curiosity and discovery around science, history, and culture. Each kit includes objects from the Museums archives, helpful resources and suggested activities. Discovery Kits are a great way for teachers to incorporate primary source and object-based learning into the classroom or as a way to prepare for or extend a Museum visit.        

Virtual Discovery Kit: Fossils (April 2020)
Calling all paleontologists! Step back on the geological timeline to explore a variety of plant and animal fossils. Learn all about the science of fossils and how prehistoric creatures lived, ate, and moved about our world.