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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 type of fossil colonial coral, dating back to the Devonian period, was later discovered on his land and named after him as the Petoskey stone. [7] This was later declared the official state stone by Governor George Romney, who officially signed a bill to that effect. A granddaughter, Ella Jane Petoskey, was present at the signing. [8] [9]
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 ...
The Petoskey Downtown Historic District consists of 102 commercial properties and two institutional structures, located along 10 blocks in Petoskey's business district, primarily along East Mitchell and Howard streets. The contributing structures range in date from 1879 to the 1920s. 32: Petoskey Grocery Company Building
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]
Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone †Hexagonaria †Hindeodus †Holopea †Homagnostus †Howittia †Icriodus †Icriodus angustoides †Icriodus taimyricus †Idiognathodus †Isograptus †Isograptus forcipiformis †Isograptus manubriatus – or unidentified comparable form
Corals were the most common animals found in Devonian Michigan. 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.