Types of gravel include:Bank gravel: naturally deposited gravel intermixed with sand or clay found in and next to rivers and streams. Also known as "bank run" or "river run".Bench gravel: a bed of gravel located on the side of a valley above the present stream bottom, indicating the former location of the stream bed when it was at a higher level. The term is most commonly used in Alaska and the Yukon Territory.Crushed stone: rock crushed and graded by screens and then mixed to a blend of stones and fines. It is widely used as a surfacing for roads and driveways, sometimes with tar applied over it. Crushed stone may be made from granite, limestone, dolomite, and other rocks. Also known as "crusher run", DGA (dense grade aggregate) QP (quarry process), and shoulder stone.Crushed stone is distinguished from gravel by the U.S. Geological Survey.Fine gravel: gravel consisting of particles with a diameter of 2 to 6.3 millimetres (0.079 to 0.248 in)Stone dust: fine, crushed, gravel from the final stage of screen separation, such that the gravel is not separated out from fine dust particles. As with other forms of crushed stone, this is distinguished from gravel by the U.S. Geological Survey.Lag gravel: a surface accumulation of coarse gravel produced by the removal of finer particles.Pay gravel: also known as "pay dirt"; a nickname for gravel with a high concentration of gold and other precious metals. The metals are recovered through gold panning.Pea gravel: also known as "pea shingle" is clean gravel similar in size to garden peas.Used for concrete surfaces, walkways, driveways and as a substrate in home aquariums.Piedmont gravel: a coarse gravel carried down from high places by mountain streams and deposited on relatively flat ground, where the water runs more slowly.Plateau gravel: a layer of gravel on a plateau or other region above the height at which stream-terrace gravel is usually found.
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