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Step inside
the Columbia 150 lobby and take a look at the large map of Oregon.
See if you can find the relatively new volcanic mountains of the
central Cascades. Find Crater Lake and Mount Hood on the map.
Looking
to the southeast, can you find the Steens
Mountains? These large blocks have been faulted above the valleys
and is the northernmost extension of the Basin and Range Province
that extends into Utah and Nevada. Find Eugene, Salem, and Portland
on the map. These cities in the Willamette Valley sit between
the Coast Range and the Cascades. Geologists believe that this
area was once part of the Pacific Ocean because fossils of sea
animals that are found throughout the valley.
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