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2. Petoskey stone - Wikipedia

   en.wikipedia.org/wiki/Petoskey_stone

   A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.

3. Hexagonaria - Wikipedia

   en.wikipedia.org/wiki/Hexagonaria

   Fossils of this genus form Petoskey stones, the state stone of Michigan. [1] They can be seen and found in most Midwestern U.S. states. Hexagonaria is a common constituent of the coral reefs exposed in Devonian Fossil Gorge below the Coralville Lake spillway [ 2 ] and in many exposures of the Coralville Formation in the vicinity of Coralville ...

4. Petosegay - Wikipedia

   en.wikipedia.org/wiki/Petosegay

   Petosegay or Biidassige (Ottawa: Light that is Coming) (c. 1787 – June 15, 1885) was a 19th-century Odawa merchant and fur trader. Both present-day Petoskey, Michigan, Petoskey State Park, and nearby Emmet County park Camp Petosega are named in his honor.

5. Traverse Group - Wikipedia

   en.wikipedia.org/wiki/Traverse_Group

   The Petoskey Formation is an arenaceous limestone named for its locale (Petoskey, Michigan), and contains the eponymous Petoskey stones. The Whiskey Creek Formation is a limestone. The Traverse Group formed as a shallow carbonate shelf during the Devonian period (~419 to 359 Ma), when the most recent supercontinent , Pangea , was just beginning ...

6. List of the prehistoric life of Michigan - Wikipedia

   en.wikipedia.org/wiki/List_of_the_prehistoric...

   Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone †Hexagonaria †Hexagonaria pericarinata †Hindia †Holopea †Icriodus †Isotelus †Isotelus gigas †Lepidodendron †Lepidodendron aculeatum †Lepidodendron Brittsii †Lepidodendron dichotomum †Lepidodendron lanceolatum †Lepidodendron ...

7. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   A 2010 effort led by State Senator Gloria J. Romero, a Democrat from Los Angeles, sought to remove serpentine from its perch as the state's official stone. Organizations such as the Asbestos Disease Awareness Organization have supported the move as the olive green rock is a source of chrysotile , a form of asbestos that can cause mesothelioma ...