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oregon biodiversity information center
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Oregon Ecoregions, developed and released by Oregon Biodiversity Information Center (ORBIC), March 2010. Based on US EPA Level III Ecoregions, with an additional Marine/Estuary Ecoregion that includes major estuaries and the oceanic nearshore and continental shelf. Oregon Ecoregions modify the US EPA Level III Ecoregions and are clipped to jurisdictional borders of Oregon. In the Coast Range and Marine/Estuary ecoregions, water/land interfaces, including coastal and riverine islands, and marine and estuarine waters, are presented in much greater detail than the delineations in the EPA shapefile. [from the original EPA Level III Ecoregion metadata]: The Level III EPA Ecoregions have been derived from Omernik (1987)...
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