Encyclopedia 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.

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