limestone lime mudstone 2013-10-12T14:51:19Z ENVO ENVO:01000273 Lime mudstone is a limestone which is primarily composed of either clay-size or both silt-size and clay-size detrital (transported) carbonate grains. ORCID:0000-0002-4366-3088 Wikipedia: The terminology of "mudstone" is not to be confused with the Dunham classification scheme for limestones. In Dunham's classification, a mudstone is any limestone containing less than ten percent carbonate grains. Note, a siliciclastic mudstone does not deal with carbonate grains. Friedman, Sanders, and Kopaska-Merkel (1992) suggest the use of "lime mudstone" to avoid confusion with siliciclastic rocks. calcilutite cementstone