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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 ...
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.
"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.
Sustainable reef net fishing is a salmon harvesting technique created and used by Lummi and Coast Salish Indigenous people over 1,000 years. In WA’s northern waters, Lummi keep sustainable ...
Though not really a castle and not really made of coral, world-famous structure built by one man is considered an engineering marvel
The northern Suwarrow Atoll rim has portions of reef dated to between 4680 and 4310 years B.P. and at the northeast of the atoll the three ridges are dated from the land out at 4220 years B.P., 3420 years B.P. and from 1250 years B.P. [2] On Mitiaro the centre of the reef flat has regions dated 5140–3620 years B.P. [2] Map of the Cook Islands