limestone
Limestone is one of the
main types of sedimentary rocks.
Sedimentary rocks are those which
result from deposition of minerals by water or wind, and limestone is defined as a bedded sediment composed primarily of
calcium carbonate (CaCO3).
Limestones are indicative of a deep-water environments, and many types of fossils are found in
them. It sometimes forms massive cliffs, like the Mississippian age
Red Wall limestone seen in the Grand Canyon of Arizona.
When limestone is modified by heat and pressure, it becomes
the stone we call marble.
Roosevelt Dam in the Salt River Canyon east of Phoenix is constructed from
blocks of limestone, which was deposited in a vast ocean during Precambrian time.
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