shale

    Article

    A fine-grained sedimentary rock formed out of mud, clay, silt, and other small minerals. In large quantities, for example on a mountain side, shale has the appearance of thin stacked layers of rock. Shale is often used in ceramics, tiles, bricks, and pottery.

    Photo Credit

     
    "Bright Angel Shale, Grand Canyon National Park, Arizona, March 7, 2016" by Cassi Knight, Paleontology Guest Scientist is licensed under Public Domain.

    Term Type
    References

     
    Encyclopedia Britannica
         N.d.   Shale (rock). http://www.britannica.com/science/shale, accessed March 15, 2016.