What is another word for marlstone?
Pronunciation: [mˈɑːlstə͡ʊn] (IPA) 
Marlstone, also known as marl or marl clay, is a sedimentary rock derived from the accumulations of clay and lime. The rock is often formed in calmer seas, lagoons, or shallow waters. Its defining characteristic is its high calcium carbonate content, which gives it a distinctive pale color, fine texture, and ability to quickly turn to lime when heated. Synonyms for marlstone include mudstone, siltstone, limestone, chalk, and tuff. The term "marl" is often used interchangeably with marlstone. Both terms refer to any deposit of loose, unconsolidated sedimentary material of a mix of clay and calcium carbonate. Despite its humble origins, marlstone has many uses in construction and agriculture due to its lime-rich composition.
