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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.
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.
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 ...
Petoskey is located on the southern shore of Little Traverse Bay, a bay of Lake Michigan. [6] Petoskey sits directly across the bay from Harbor Springs, another Emmet County city. Petoskey is a popular Midwestern resort town. [7] Petoskey lends its name to the Petoskey stone, a fossilized coral that is the state stone of Michigan. [8]
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.