: a rock composed chiefly of silt hardened by heat, pressure, or cementation
Example Sentences
Recent Examples on the WebThe crocodile sample, which was initially preserved in a siltstone mass, had been partially crushed. Sana Noor Haq, CNN, 14 Feb. 2022 The reddish-brown siltstone, orange sandstone, and green clay stone are eroded into intricate swirls, icicles, cones, and rounded rec rooms. John Phillips, Car and Driver, 24 Mar. 2020