Coal measures

Coal measures refer to the layers of sedimentary rock that contain significant deposits of coal formed from ancient plant material. These layers are typically found in specific regions where conditions allowed plants to accumulate and be buried quickly, transforming into coal over millions of years. They are often associated with features like shale and sandstone, and they represent a distinct geological period when lush vegetation thrived, later compressed into coal. These measures are important for understanding the Earth's geological history and are primary sources of coal used for energy and industrial purposes today.