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shale

shale, sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e., it tends to split along planar surfaces between the layers of stratified rock. Shales comprise an estimated 55% of all sedimentary rocks. The composition of shale varies widely. Shales with very high silica content may have been formed when large quantities of diatoms and volcanic ash were present in the original sediment. Large numbers of fossils in shales may give them a high calcium content; such shales may grade into limestones. Shales that contain a large percentage of alumina are used as a source of that mineral in the manufacture of cement, and those that contain natural gas and petroleum have become a significant energy resource in the 21st cent. due to the use of hydraulic fracturing techniques in drilling. Shales containing abundant carbonaceous matter grade into bituminous coal.

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"shale." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/shale

"shale." The Columbia Encyclopedia, 6th ed.. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/shale

shale

shale / shāl/ • n. soft, finely stratified sedimentary rock that formed from consolidated mud or clay and can be split easily into fragile slabs. DERIVATIVES: shal·y (also shal·ey) adj.

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"shale." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale-0

"shale." The Oxford Pocket Dictionary of Current English. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale-0

shale

shale Fine-grained, fissile, sedimentary rock composed of clay-sized and silt-sized particles of unspecified mineral composition. The noun may be qualified by an adjective (e.g. black shale, paper shale, and oil shale).

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"shale." A Dictionary of Ecology. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." A Dictionary of Ecology. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/shale-0

"shale." A Dictionary of Ecology. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/shale-0

shale

shale Fine-grained, fissile, sedimentary rock composed of clay-sized and silt-sized particles of unspecified mineral composition. The noun may be qualified by an adjective(e.g. black shale, paper shale, and oil shale).

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"shale." A Dictionary of Earth Sciences. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/shale

"shale." A Dictionary of Earth Sciences. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/shale

shale

shale XVIII prob. — G. schale (not used in this sense, but cf. schalstein laminated limestone, schalgebirge mountain system of thin strata) = OE. sċ(e)alu SCALE1..
So shaly (-Y1) XVII.

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"shale." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale-1

"shale." The Concise Oxford Dictionary of English Etymology. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale-1

shale

shale Common sedimentary rock formed from mud or clay. Characterized by very fine layering, it may contain various materials such as fossils, carbonaceous matter and oil.

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"shale." World Encyclopedia. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." World Encyclopedia. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/shale

"shale." World Encyclopedia. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/shale

shale

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"shale." Oxford Dictionary of Rhymes. . Encyclopedia.com. 24 Aug. 2017 <http://www.encyclopedia.com>.

"shale." Oxford Dictionary of Rhymes. . Encyclopedia.com. (August 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale

"shale." Oxford Dictionary of Rhymes. . Retrieved August 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/shale