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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.
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 ...
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 ...
There were three types of coral found in Devonian Michigan: branching, colony, and solitary corals. These corals are found as fossils in almost every fossil site in Michigan. This is because the Devonian was a time of great reefs, which covered most of the world's oceans. Corals were a crucial element for these reefs, especially the Rugose corals.
More recent events relevant to paleontology in Michigan include the 1965 designation of the Petoskey stone, which is made of fossil coral, as the state stone of Michigan. Also relevant was the 2002 designation of the American mastodon, Mammut americanum as the Michigan state fossil.
Though not really a castle and not really made of coral, world-famous structure built by one man is considered an engineering marvel
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 ...
Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone †Hexagonaria †Hexagonaria pericarinata †Hindia †Hindia subrotunda †Hippocardia †Hippocardia monroica †Hippurograptus †Hiscobeccus †Hiscobeccus capax; Fossilized shells of the Ordovician-Carboniferous sea snail Holopea †Holopea