Young Blonde Girl On The Sedimentary Rocks

- Most types of limestone are formed from the calcareous skeletons of organisms such as corals, mollusks, and foraminifera.
- Coal which forms as plants remove carbon from the atmosphere and combine with other elements to build their tissue.
- Deposits of chert formed from the accumulation of siliceous skeletons from microscopic organisms such as radiolaria and diatoms.