Willamette Valley Erratics
Courtesy of the floods, Oregon's fertile Willamette Valley boasts
not only rich soils that once mantled the scablands far to the
east but also glacial "erratics" (rocks carried far from their
site of origin). Geologists believe these erratics arrived inside
icebergs caught in a Glacial Lake Missoula flood. When the bergs
grounded and melted here, the rocks were left high and dry,
hundreds of miles from where they once lay.