Oregon History
| About 200 mya, the
continental shelf appears to have been at an angle from the northeast corner
of the state to the Klamaths. The initiation of the collision of the Juan de
Fuca plate may have begun at the time of the separation of North America from
Europe. |
|
| As the ocean floor
began to sink beneath the continent, the coastal plain and shelf sediments
were scraped off against the edge of the continent and formed as a coastal
range, the Blue Mountains and the Wallowa Mtns. and in the Klamath area (only
a small part of the original Klamath remains). This scraping (including an
occasional seafloor scrap) is jumbled and almost unrecognizable “confused
heap.” |
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