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The Cascadia bioregion. The area from Vancouver, B.C. down to Portland, Oregon has been termed the Cascadia Megaregion, a megaregion defined by the U.S. and Canadian governments, especially along the 'Cascadia Corridor'. Megaregions are defined as areas where "boundaries begin to blur, creating a new scale of geography now known as the megaregion.
English: A map showing the two definitions of the proposed "Republic of Cascadia." Green shows the American states of Oregon and Washington; and the Canadian province of British Columbia (which make up the standard definition). The black-dotted line marks the border of the Cascadia bioregion (which is also mentioned as a border).
Cascadia Cave is nearby. The cave is an 8,000-year-old American Indian petroglyph site considered to have the largest concentration of rock engravings in western Oregon. [3] Willamette Valley settlers developed a bypass at the park site for horse-drawn wagons. Old wagon ruts are still visible near where Soda Creek meets the South Santiam River. [2]
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This image is a derivative work of the following images: File:BlankMap-USA-states-Canada-provinces,_HI_closer.svg licensed with Cc-by-sa-2.5 . 2007-12-08T21:18:24Z Lokal Profil 1730x1730 (216736 Bytes) Code trimming
None of the multiple possible definitions of the Pacific Northwest is universally accepted. This map shows three possibilities: (1) The shaded area shows the historical Oregon Country. (2) The green line shows the Cascadia bioregion. [6] (3) The labeled states and provinces include Washington, Oregon and British Columbia.
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These faults cut through the Western Mélange Belt (WMB; blue area in map), exposed from North Bend (on Interstate 90) to Mount Vernon. [72] The WMB is an assemblage of Late Jurassic and Cretaceous rock (some of it as much as 166 million years old) collected in the accretionary wedge (or prism) of a subduction zone. [73]