detrital sediment

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• Sediment Profile Imagery — (SPI) is an underwater technique for photographing the interface between the seabed and the overlying water. The technique is used to measure or estimate biological, chemical, and physical processes occurring in the first few centimetres of… …   Wikipedia

• Olduvai Gorge — /awl doo vuy / a gorge in Tanzania in which is located a site containing Australopithecine and human skeletal and cultural remains. * * * Archaeological site in the eastern Serengeti Plains, northern Tanzania. It is a steep sided ravine about 30… …   Universalium

• North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …   Universalium

• Yoredale Series — The Yoredale Series, in geology, is a local phase of the lower Carboniferous rocks of the north of England. The name was introduced by J. Phillips on account of the typical development of the phase in Yoredale (Wensleydale), Yorkshire. Properties …   Wikipedia

• sand — [1] to smooth or clean a surface by rubbing with sandpaper. Sanding usually refers to hand tools such as sandpaper, while grinding always refers to power tools such as angle grinders. [2] A term popularly applied to loose, unconsolidated… …   Dictionary of automotive terms

• 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

• Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …   Universalium

• Australia — /aw strayl yeuh/, n. 1. a continent SE of Asia, between the Indian and the Pacific oceans. 18,438,824; 2,948,366 sq. mi. (7,636,270 sq. km). 2. Commonwealth of, a member of the Commonwealth of Nations, consisting of the federated states and… …   Universalium

• Lentic ecosystems — are the ecosystems of lakes, ponds and swamps. Included in these environments are the biotic interactions (amongst plants, animals and micro organisms) together with the abiotic interactions (physical and chemical).cite book | last = Brown first …   Wikipedia

• Slave craton — which is one of the oldest dated rock units on Earth at 4.03 Ga. The crust of the Slave craton is thought to have amalgamated during a 2.69 Ga collision between a proto Slave western basement complex, known as the Central Slave Basement Complex,… …   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