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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 coral reefs may themselves be subdivided into the outer reef on the edge of the Florida carbonate platform, the patch reefs between the outer reef and the keys, and the reefs in the shoals on either side of the keys. The offshore reefs are dominated by elkhorn coral to 10-meter (33 ft) water depth, and staghorn coral below 10
Florida's Coral Reef, the only coral reef system in the continental United States and the third-largest barrier reef ecosystem in the world, is a shallow-water reef. This deep-sea one is ...
John Pennekamp Coral Reef State Park is a Florida State Park located on Key Largo in Florida. It includes approximately 70 nautical square miles (240 km 2 ) of adjacent Atlantic Ocean waters. The park is approximately 25 miles in length and extends 3 miles into the Atlantic Ocean along the prominent Hawk Channel passage.
The Miami Terrace Reef 1] is a coral reef off the coast of Florida stretching from South Miami to Boca Raton, in the Atlantic It lies in depths of 650 to 2,000 feet (200 to 610 m) on top of a geological formation known as the Miami Terrace, a 40-mile (65 km) long shelf about 15 miles (24 km) off shore. [ 2 ]
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 ...