What is another word for mudstone?
Pronunciation: [mˈʌdstə͡ʊn] (IPA) 
Mudstone is a fine-grained sedimentary rock that is composed of clay or silt-sized particles. Some common synonyms for mudstone include shale, claystone, argillite, and mudrock. Shale is a type of mudstone that is laminated and breaks into thin layers, while claystone is a more compact version of mudstone that does not contain many visible layers. Argillite is a dense, fine-grained rock that is similar to mudstone but has undergone more metamorphism, making it harder and more durable. Mudrock is a general term used to describe any sedimentary rock that is composed primarily of mud or clay. These synonyms are often used interchangeably to describe similar types of sedimentary rocks that are formed from the same types of sediment.
