Limestone unknown fossil

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True starfish fossils are rare but can be found in limestones.

Explanation:

Limestone is a sedimentary rock made almost entirely of fossils. Fossils are the remains of ancient plants and animals, like an imprint in a rock or actual bones and shells that have turned into rock. Fossils are found in sedimentary rocks and hold the clues to life on Earth long ago.

1. Common fossils in the limestone, from left to right: corals, brachiopods, snails, and crinoids. Corals are common in the limestones of the Burren, and are often concentrated at specific levels in the limestone. Corals are still alive today, and form great reefs in shallow tropical waters.

Fossils are most common in limestones. That is because most limestones consist partly or mostly of the shells of organisms. Sometimes, however, the shells are worn so much that they look like sediment grains rather than "real" fossils. Fossils are also common in shales, which form from muds.

Because limestone contains the remains of dead organisms, it is considered an organic sedimentary rock. There are rare chemical sedimentary rocks that form from the precipitation of calcium carbonate from ocean water. ... Limestone turns into the metamorphic rock marble when subjected to high amounts of pressure and heat.

True starfish fossils are rare but can be found in limestones.

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