overlying strata

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• coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …   Universalium

• salt dome — Geol. a domelike rock structure that is formed beneath the earth s surface by the upward movement of a mass of salt, may reach thousands of feet in vertical extent, and is more or less circular in plan: often associated with oil and gas pools. Cf …   Universalium

• geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium

• 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

• stratum — [ strα:təm, streɪtəm] noun (plural strata tə) 1》 a layer or a series of layers of rock. 2》 a thin layer within any structure. 3》 a level or class of society. Origin C16: mod. L., from L., lit. something spread or laid down , neut. past participle …   English new terms dictionary

• cap rock — noun : cap I 2a(3) * * * Geol. 1. a mass of anhydrite, gypsum, or limestone immediately above the salt of a salt dome. 2. an impervious stratum overlying an oil or gas bearing structure. Also, caprock. [1865 70, Amer.] * * * cap rock noun A… …   Useful english dictionary

• Nashville Basin — A false color satellite image of the Nashville Basin The Nashville Basin, also known as the Central Basin, is a term often used to describe the area surrounding Nashville, Tennessee. The Central Basin was caused by an uplifting known as the… …   Wikipedia

• Geyser — For other uses, see Geyser (disambiguation). Strokkur geyser, Iceland …   Wikipedia

• Talgar — Infobox City official name = Talgar native name = Талғар motto = image pushpin pushpin label position =bottom pushpin mapsize = 280 pushpin map caption =Location in Kazakhstan map caption = Location in Kazakhstan subdivision type = Country… …   Wikipedia

• Eifelian Stage — ▪ geology       lowermost of the two standard worldwide divisions of Middle Devonian (Devonian Period) rocks and time. Eifelian time spans the interval between 397.5 million and 391.8 million years ago. The name of the Eifelian Stage is derived… …   Universalium

• Underground mining methods —   A drift mine is driven horizontally into coal that is exposed or accessible in a hillside. In a hydraulic mine, high pressure water jets break the coal from a steeply inclined, thick coalbed that would be difficult to mine with the usual… …   Energy terms