shale

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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).

shale

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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.

shale

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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).

shale

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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.

shale

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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.