Question

You find a deposit of organic limestone. In what type of setting did it probably form?

Answer 1

It most likely formed in an ocean environment.

Explanation:

Organic limestone usually contains fossils of sea creatures that died and sank to the bottom of the sea where they lived. Plants, shells, and other organic materials also sink to the sea floor. These are called sediments. As thousands of years pass, the dead plants and animal sediments form thick and thin layers of calcium carbonate, pressing down on each other and squeezing out water and oxygen. Most limestone has a granular texture. Under a microscope, you can see the tiny grains of animal shells, sand, and plant parts.