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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. 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 ...

  4. Petosegay - Wikipedia

    en.wikipedia.org/wiki/Petosegay

    A particular variety of stone was found in abundance on his former lands and named after him, and the Petoskey stone was designated as the official state stone. His granddaughter, Ella Jane Petoskey, was asked by Michigan Governor George W. Romney to be an honored signatory on the bill assigning the Petoskey Stone as the state stone.

  5. 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 ...

  6. Petoskey - Wikipedia

    en.wikipedia.org/wiki/Petoskey

    Petoskey station; Petoskey stone, a fossilized coral that is the state stone of Michigan. This page was last edited on 21 December 2022, at 00:20 (UTC). Text is ...

  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 ...