shale

   Shale is one of the main types of sedimentary rocks.  Sedimentary rocks are those which result from deposition of minerals by water or wind. 
   Shale is defined as a laminated sediment composed primarily of clay-sized particles.
   Shale usually shows distinct bedding planes, and it can easily be split apart along those planes.  Many types of fossils are found in shales, and it a source of some of the most detailed fossil specimens we have.  It can also be very colorful, especially in Arizona.
   When shale is slightly modified by heat and pressure, it becomes the stone we call slate.

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