- a rock of fissile or laminated structure formed by the consolidation of clay or argillaceous material.
Origin of shale
Examples from the Web for shale
Thanks to the shale revolution, domestic oil production is soaring.Why the Keystone XL Pipeline May Not Be Built
November 19, 2014
Volcanoes spewed lava and ash, ocean floors were thrust upward, sand and rock and shale settled into slurry.Napa’s Earthquake Is Not The Only Thing Shaking The Vineyards
August 31, 2014
Thanks to the shale revolution and new technology, locomotives could burn a lot cleaner and cheaper.
Thanks to the shale revolution, the U.S. has abundant supplies of natural gas.
Makovich himself is a keen ecologist—and other members like him are opposed to shale gas drilling.Inside East Ukraine’s Make-Believe Republics
May 15, 2014
The narrowest and deepest gorge is hundreds of feet deep in the shale.Yorkshire Painted And Described
I pushed him on over a sloping peak of shale, and told him to hold his tongue.The House Under the Sea</p>
Sir Max Pemberton
If the layers were of sand, the rock is sandstone; if of clay, it is shale.Boy Scouts Handbook
Boy Scouts of America
The inside of the cave is a shale that no one could dig into.The Boy Scout Treasure Hunters
Charles Henry Lerrigo
Green and red marl, shale, and shaly limestone with some veins of gypsum.Old Mackinaw
W. P. Strickland.
- a dark fine-grained laminated sedimentary rock formed by compression of successive layers of clay-rich sediment
Word Origin and History for shale
1747, possibly a specialized use of Middle English schale "shell, husk, pod" (late 14c.), also "fish scale," from Old English scealu (see shell (n.)) in its base sense of "thing that divides or separate," in reference to the way the rock breaks apart in layers. Cf. Middle English sheel "to shell, to take off the outer husk" (late 15c.). Geological use also possibly influenced by German Schalstein "laminated limestone," and Schalgebirge "layer of stone in stratified rock."
- A fine-grained sedimentary rock consisting of compacted and hardened clay, silt, or mud. Shale forms in many distinct layers and splits easily into thin sheets or slabs. It varies in color from black or gray to brown or red.
A sedimentary rock formed from layers of clay.