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Why does limestone occur in layers?

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It is laid down in water by precipitation. Most limestone beds you see today at the surface were laid down in shallow seas, where calcium carbonate was precipitated out of seawater. Some were laid down deep in the oceans. However not too deep. read more

Limestone is an organic sedimentary rock that could be formed when the skeletal remains of tiny micro organisms are deposited on the bottom of the sea and then this material is then compressed by the weight of overburden (more deposits above it) to form solid rock layers. It can also be formed by evaporation. read more

Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). About 10% of sedimentary rocks are limestones. read more

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Further Research

Chapter 4 Rocks and Minerals
volcano.oregonstate.edu

What is limestone?
geography.learnontheinternet.co.uk