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Hexagonaria is a genus of colonial rugose coral. Fossils are found in rock formations dating to the Devonian period, about 350 million years ago. Specimens of Hexagonaria can be found in most of the rock formations of the Traverse Group in Michigan. Fossils of this genus form Petoskey stones, the state stone of Michigan. [1]
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
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.
Agatized coral from the Hawthorn Group (Oligocene–Miocene), Florida. An example of preservation by replacement. An example of preservation by replacement. Fossils from beaches of the Baltic Sea island of Gotland , placed on paper with 7 mm (0.28 inch) squares
The class includes important coral reef builders such as the stony corals, sea anemones, and zoanthids. The recognized orders are shown below: [4] Actiniaria – sea anemones; Antipatharia – black corals; Corallimorpharia – corallimorpharians aka "false corals" †Rugosa – rugose corals; Scleractinia – stony corals †Tabulata ...
The skeleton of a black coral is hard and inert, due to its composition of protein and chitin, making it nearly inedible. Though black coral skeletons have been found in the stomachs of green sea turtles and sharks, these incidents are rare; it has thus been suggested that black corals are not a major part of any vertebrate diets. [9]
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Favosites is an extinct genus of tabulate coral characterized by polygonal closely packed corallites (giving it the common name "honeycomb coral"). [1] The walls between corallites are pierced by pores known as mural pores which allowed transfer of nutrients between polyps.