particles of detrital rock

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• 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

• rock — rock1 rockless, adj. rocklike, adj. /rok/, n. 1. a large mass of stone forming a hill, cliff, promontory, or the like. 2. Geol. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable… …   Universalium

• Rock — /rok/, n. a male given name. * * * I In geology, a naturally occurring and coherent aggregate of minerals. The three major classes of rock igneous, sedimentary, and metamorphic are based on the processes that formed them. These three classes are… …   Universalium

• 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

• Detritus (geology) — Detritus (English pronunciation: /dɪˈtraɪtəs/, adjective detrital, pronounced /dɪˈtraɪtəl/) is a geological term used to describe particles of rock derived from pre existing rock through processes of weathering and erosion. Detrital… …   Wikipedia

• detritus — detrital, adj. /di truy teuhs/, n. 1. rock in small particles or other material worn or broken away from a mass, as by the action of water or glacial ice. 2. any disintegrated material; debris. [1785 95; < F détritus < L: a rubbing away, equiv.… …   Universalium

• Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …   Wikipedia

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …   Universalium

• clay — clay1 claylike, adj. /klay/, n. 1. a natural earthy material that is plastic when wet, consisting essentially of hydrated silicates of aluminum: used for making bricks, pottery, etc. 2. earth; mud. 3. earth, esp. regarded as the material from… …   Universalium

• Clay — /klay/, n. 1. Bertha M. (Charlotte Monica Braeme), 1836 84, English author: originator of a long series of romantic novels. 2. Cassius Marcellus, 1810 1903, U.S. antislavery leader and diplomat. 3. Cassius Marcellus, Jr., original name of… …   Universalium