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Gravel(noun) small stones, or fragments of stone; very small pebbles, often intermixed with particles of sand. Gravel(noun) a deposit of small calculous concretions in the kidneys and the urinary or gall bladder; also, the disease of which they are a symptom. Gravel(verb) to cover with gravel; as, to gravel a walk.
Conglomerate is a hardened, generally cemented gravel and like sand, silt and clay, has been formed by the breaking down of older rocks and by later redeposition. Commonly it is found interbedded with layers of sandstone.ravel deposits vary greatly in mineral composition, size, shape and color. The term gravel usually means a rock composed of particles ranging from sand to pebble or boulder sizes (2mm +) (Table 2) . Glacial outwash gravels or Tills occur in northeastern Kansas.