sedimentary
Sedimentary rocks are those which
result from deposition of minerals in prehistoric times by water or wind. They are
familiar to many people as sandstone, shale, or limestone, for
example.
Much of Arizona's great scenery results from sedimentary rock
formations. Great deserts during the Triassic Period, for example, have left us
towering cliffs and mesas in the northern part of the state -- the lines of the ancient
dunes are still visible on rock faces.
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.
There are many illustrations (for example) of these kinds of rocks visible on the
website:
- the Red Rocks of Sedona
- the west end of Camelback Mountain
- the sandstone & conglomerate at Papago Park
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