What sedimentary rock can be formed can be formed from things that were alive?

Answer 1

1.) Coal. Coal is generally formed from prehistoric plant material usually in a swamp environment The plants die and are buried in a low energy, low oxygen environment. The material then forms coal as a function of pressure, temperature and time.

2.) Coquina. Coquina is a general rock name for another type of sed rock that can be said to have been formed by living creatures. It is a rock almost completely comprised of broken up and weathered fossils of trilobites, mollusks, brachiopods and other invertebrates.

Answer 2

Limestone is a common sedimentary rock formed from the remains of marine organisms such as shells, coral, and calcareous algae. Coal is another sedimentary rock that forms from the accumulation and compression of plant material in swamps and bogs.