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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.
Coral Rock is an album by jazz saxophonist Archie Shepp recorded in Europe in 1970 for the America label at the same sessions which produced Pitchin Can.
Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height.
This rock is either maricultured and sold as live rock, or can be purchased and grown in the home aquarium. Base rock can also be made from artificial rock called aragocrete, which is a hand made concrete from combining crushed aragonite, sand, and Portland cement. After allowing the cement to dry, the pieces are sometimes acid washed to ...
A coral reef is an underwater ecosystem characterized by reef-building corals. ... sessile invertebrates, and bare rock and sand. The size, shape and relative ...
Coral reef at Nusa Lembongan, Bali, Indonesia Pamalican island with surrounding reef, Sulu Sea, Philippines A reef surrounding an islet Reefs off Vanatinai Island in the Louisiade Archipelago. A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. [1]
Coralline rock is a type of rock formed by the death of layers of coralline algae.It is visually quite bright like the algae, and is often desired as aquarium decoration. . Since it is formed from the dead algae, it contains some nutrients and calcium carbonate, which has allowed it to be used in some building structu
It is predominantly a coralliferous sedimentary rock, laid down in the Oxfordian stage of the Jurassic. [1] It is a hard variety of "coral rag". Building stones from this geological structure tend to be irregular in shape. It is often found close to seams of Portland Limestone (e.g. Abbotsbury in Dorset, England).