: an indurated shale produced by the consolidation of mud
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The organic compounds, the largest ever found on Mars, were believed to be fragments of fatty acids preserved in ancient mudstone in the Gale Crater, according to NASA.—Eric Lagatta, USA Today, 17 Feb. 2026 By combining measurements of different elements in Earth's crust and mantle, rock core observations, and natural gamma-ray data from Jurassic-era lake mudstones, the team reconstructed how environmental conditions changed through time.—Stefanie Waldek, Space.com, 12 Jan. 2026 The discovery of sulfur-rich organics followed in 2018, and just this year, more complex, long-chain alkanes were found in Martian mudstones.—Dirk Schulze-Makuch, Big Think, 17 Sep. 2025 Their images revealed that Bright Angel is a mudstone, a type of sedimentary rock formed from fine sediments deposited in water.—Ari Koeppel, The Conversation, 17 Sep. 2025 See All Example Sentences for mudstone