: a rock that consists of a mixture of clay materials and calcium carbonate and often contains kerogen
Example Sentences
Recent Examples on the WebLocated on the west coast of Sicily, a blindingly white marlstone cliff marches toward the sea like a staircase, leading to an isolated beach below. Anne Olivia Bauso, Travel + Leisure, 12 Apr. 2021 The truck is used to haul lime and marlstone, which contains clay and silt, from the sides of mountains in Switzerland. Courtney Linder, Popular Mechanics, 21 Aug. 2019