Q-What are the different types of Gravel?
A-Multiple types of gravel have been recognized, including;
Bank gravel: gravel intermixed with sand or clay.
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.
Creek rock: This is generally rounded, semi-polished stones, potentially of a wide range of types, that are dredged or scooped from river beds and creek beds. It is also often used as concrete aggregate and less often as a paving surface.
Crushed Rock: Crushed Rock is mechanically broken into small pieces then sorted by filtering through different size mesh.
Crushed Stone: This is generally Limestone or dolomite that has been crushed and graded by screens to certain size classes. Hence the name “crushed stone“. It is widely used in concrete and as a surfacing for roads and driveways, “driveway gravel” sometimes with tar applied over it. Crushed stone may also be made from granite and other rocks. A special type of limestone crushed stone is dense grade aggregate, or DGA, also known as crusher run. This is a mixed grade of mostly small crushed stone in a matrix of crushed limestone powder. Crushed stone is is very commonly used for driveways. The most common sizes of crushed stone is range from 3/8 crushed stone, 5/8 crushed stone, 3/4 crushed stone, 1 1/2 crushed stone, 2 1/2 crushed stone. You may be able to find crushed stone in other sizes as well.
Fine gravel: gravel consisting of particles with a diameter of 1 to 2 mm.
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.
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.
River run gravel: naturally deposited gravel found in and next to rivers and streams.
Defined by wikipedia.com