Mudstone is one of the important type of rocks. If we have to define Mudstone in general, Mudstone is a fine-grained, dark gray sedimentary rock, which is formed from silt and clay and is similar to shale but has less laminations. Mudstone comes under Sedimentary Rocks. All Sedimentary Rocks have similar properties and formation process. Along with Mudstone Definition, know more about the History of Mudstone, Etymology of Mudstone in next sections.