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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. Syringopora - Wikipedia

    en.wikipedia.org/wiki/Syringopora

    Syringopora is an extinct genus of phaceloid tabulate coral. [1] It has been found in rocks ranging in age from the Ordovician to the Permian, although it was most widespread during the Silurian, Devonian, and Carboniferous periods.

  4. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...

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

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

    Patuxent River stone agate (2004) Massachusetts [38] Babingtonite (1971) Roxbury puddingstone (1983) Rhodonite (1979) Michigan [39] Petoskey stone fossilized coral (1965) Chlorastrolite (aka Isle Royale greenstone) (1972) Minnesota [40] Lake Superior agate (1969) Mississippi [41] [42] Petrified wood (1976) Opal (2023) Missouri [43]

  6. Rugosa - Wikipedia

    en.wikipedia.org/wiki/Rugosa

    "Tetracorallia" from Ernst Haeckel's Kunstformen der Natur, 1904 Cross-section of Stereolasma rectum, a rugose coral from the Middle Devonian of Erie County, New York. The Rugosa, also called the Tetracorallia, rugose corals, or horn corals, are an extinct order of solitary and colonial corals that were abundant in Middle Ordovician to Late Permian seas.

  7. 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 ...

  8. List of fossil sites - Wikipedia

    en.wikipedia.org/wiki/List_of_fossil_sites

    This list of fossil sites is a worldwide list of localities known well for the presence of fossils. Some entries in this list are notable for a single, unique find, while others are notable for the large number of fossils found there.

  9. Fossil - Wikipedia

    en.wikipedia.org/wiki/Fossil

    A derived, reworked or remanié fossil is a fossil found in rock that accumulated significantly later than when the fossilized animal or plant died. [100] Reworked fossils are created by erosion exhuming (freeing) fossils from the rock formation in which they were originally deposited and their redeposition in a younger sedimentary deposit.

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