Sorting (sediment) — Sorting indicates the distribution of grain size of sediments, either in unconsolidated deposits or in sedimentary rocks. Poorly sorted indicates that the sediment sizes are mixed (large variance); whereas well sorted indicates that the sediment… … Wikipedia
Transportation (sediment) — In geology, transportation refers to the movement of eroded debris, whether by rivers, glaciers, wind or ocean currents and tides. Particle sizes can vary from tiny clay particles suspended in moving water, to pebbles and boulders. As the… … Wikipedia
Round — or rounds can mean:* The shape of a circle or sphere * Rounding (sediment), the smoothness of a sediment particle * Roundedness, the roundedness of the lips in the pronunciation of a phoneme * Rounding, the truncation of a number to reduce the… … Wikipedia
Sphericity — is a measure of how spherical (round) an object is. As such, it is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, [cite journal |first=Hakon |last=Wadell |title=Volume, Shape and Roundness of Quartz Particles… … Wikipedia
Sedimentary rock — Middle Triassic marginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwestern Utah, USA Sedimentary rock are types of rock that are formed by the deposition of material at the Earth s surface and within… … Wikipedia
Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… … Wikipedia
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Cross-bedding — Crossbedding of sandstone near Mt. Carmel road, Zion Canyon, indicating wind action and sand dune formation prior to formation of rock (NPS photo by George A. Grant, 1929) … Wikipedia
Clastic rock — A thin section of a clast (sand grain), derived from a basalt score. Vesicles (air bubbles) can be seen throughout the clast. Plane light above, cross polarized light below. Scale box is 0.25 mm Clastic rocks are composed of fragments, or clasts … Wikipedia
glacier — glaciered, adj. /glay sheuhr/, n. an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of… … Universalium
