a very fine-grained sandstone, mainly consolidated silt.
a variety of fine sandstone formed from consolidated silt
A fine-grained sedimentary rock consisting primarily of compacted and hardened silt. Siltstones are similar to shale but without laminations. They vary in color from black or gray to brown or red.
noun 1. earthy matter, fine sand, or the like carried by moving or running water and deposited as a sediment. verb (used without object) 2. to become filled or choked up with silt. verb (used with object) 3. to fill or choke up with silt. noun 1. a fine deposit of mud, clay, etc, esp […]
plural noun 1. a British Celtic tribe resident in southeastern Wales at the time of the Roman conquest of Britain. plural noun 1. a powerful and warlike tribe of ancient Britain, living chiefly in SE Wales, who fiercely resisted Roman invaders in the 1st century a.d
adjective 1. of or relating to the Silures or their country. 2. Geology. noting or pertaining to a period of the Paleozoic Era, occurring from 425 to 405 million years ago, notable for the advent of air-breathing animals and terrestrial plants. noun 3. Geology. the Silurian Period or System of rocks. adjective 1. of, denoting, […]
noun 1. any of numerous Old World freshwater fishes of the family Siluridae, comprising the catfishes. adjective 2. belonging or pertaining to the family Siluridae. noun 1. any freshwater teleost fish of the Eurasian family Siluridae, including catfish, such as Silurus glanis (European catfish), that have an elongated body, naked skin, and a long anal […]