At the edges of ancient freshwater lakes, mudstone is formed when layers of rock and minerals are compacted under pressure
a sedimentary rock composed of silt and clay particles, compacted and weakly cemented together by a small quantity of lime
An indurated shale produced by the consolidation of mud Primarily a field term used to temporarily identify fine-grained sedimentary rocks of unknown mineral content
General term used to describe a very fine-grained sedimentary rock Mud-sized particles that have solidified under water or underground are often identified as mudstone