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
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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