A course mixture of sand with pebbles and cobbles, laid down by rivers, with pebbles and cobbles derived from the erosion of rocks upstream in the catchment area of the river. Diamondiferous gravel contains diamonds derived from the erosion of other diamond-bearing rocks upstream.
Is a non-coherent natural mineral aggregate from natural disintegration of rock. It consists mainly of rounded pebbles for sub-angular rock fragments. It normally occurs in sand and gravel deposits or detritus.
(non processed) The principle paving material, and in all probability the oldest paving material. It is of course important to select a high quality paving gravel. River washed round gravel is soft and not as compact able as most processed gravel's (see processed gravel). Sharp stone gravel in a range of stone sizes self binds to form a smooth and stable surface. Natural or riverbank gravel's can have a wide variety of stone sizes but also have less compact ability.
Small stones or fragments of stone or very small pebbles larger than the particles of sand, but often mixed with them. Generally 4.76 to 75mm in size. (Stones 75 to 300 mm are usually called "cobbles".
The amount (visual abundance estimate) of gravel-sized (2 mm) materials that occur on the surface and in the A1 horizon and include hard (when moist), coarse fragments and segregations of pedogenic origin.
Rounded or semi-rounded particles of rock that will pass a 3 in. (75 mm) and be retained on a No. 4 (4.75 mm) U.S. standard sieve which naturally occurs in streambeds or riverbanks that have been smoothed by the action of water. A type of soil as defined by the Unified Soil Classification System having particle sizes ranging from the No. 4 (4. 75 mm) sieve size and larger.
Gravel is rock that is of a certain grain size range. In geology, gravel is any loose rock that is at least two millimeters in its largest dimension (about 1/12 of an inch) and no more than 75 millimeters (about 3 inches). Sometimes gravel is restricted to rock in the 2-4 millimeter range, with pebble being reserved for rock 4-75 millimeters (some say 64 millimeters).
Infection of the hoof resulting from a crack in the white line (the border between the insensitive and sensitive laminae). An abscess usually forms in the sensitive structures and eventually breaks at the coronet as the result of the infection.
A disease characterized by multiple small calculi (stones or concretions of mineral salts) which are formed in the kidneys, passed along the ureters to the bladder, and expelled with the urine. Synonym: kidney stone.