How is organic limestone made?

Answer 1

It is a sedimentary rock, and is therefore formed when layers of sand/mud and animal remains fall to the bottom of an ocean or lake, and slowly decompose and are crushed together by the weight of the water, forming a rock. This is why sedimentary rocks often contain fossils- its those dead animals.

Answer 2

Remember that limestone is the result from natural processes in the ocean and other marine waters, so it is not intentionally created by any one organism. When any shelled sea creature dies, its shell collects near the bottom of the water. Here, it decays and becomes a part of the rock known as limestone. So, limestone is made of decayed calcium, or calcite.

+++

Almost - but a chemicalelement cannot decay! The primary mineral of this sedimentary rock is calcite,calcium carbonate, which is a chemical compund(CaCO3). Limestone will also form from the compound precipitating from solution in the sea-water - which isalso the source for that taken up by the shell-fish, although many species secrete it as aragonite rather than calcite.

Answer 3

Organic limestone is formed from the remains of marine organisms such as coral and shells that accumulate over time at the bottom of bodies of water. Through a process called lithification, these organic materials are compressed and cemented together to form limestone rock. The organic matter in limestone gives it a distinctive composition and can affect its characteristics.

Answer 4

Organic or bioclastic limestone is formed from the remains of marine organisms.