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The Oregon Badlands Wilderness is a wilderness area located east of Bend in Deschutes and Crook counties in the U.S. state of Oregon. The wilderness is managed by the Bureau of Land Management as part of the National Landscape Conservation System and was created by the Omnibus Public Land Management Act of 2009, which was signed into law by President Barack Obama on 30 March 2009. The area is known for igneous castle-like rock formations, harsh terrain, ancient Juniper trees, sagebrush, and extensive arid land. Desert wildflowers, dry river canyons, and Native American pictographs can be found.〔(【引用サイトリンク】 Badlands Proposed Wilderness )〕 The blind iditarod racer Rachel Scdoris trained in the area, and the wilderness is home to the western terminus of the Oregon Desert Trail.〔(【引用サイトリンク】url=http://onda.org/where-we-work/oregon-desert-trail )〕 == Geology == The wilderness is situated on high desert terrain and is associated with a volcanic rootless shield.〔 This broad volcanic shield issued lava from a rootless vent.〔 〕 The lava flow dates to about 80,000 years old and comes from a main vent further up the slopes of Newberry Volcano.〔〔 This main vent was located near Lava Top Butte and the lava that came out of this vent travelled through the Arnold Lava Tube System to arrive at the current location of the Badlands.〔 An irregularly-shaped pit crater at the top of the shield marks the site where lava flowed in all directions to create the Badlands.〔(Badlands Natural History ) - Oregon Natural Desert Association〕 Lava tubes acted as conduits for the lava in some instances and are evidenced on the surface by tumuli, also known as pressure ridges.〔〔(【引用サイトリンク】title=Oregon High Desert Grotto )〕 Soils in the Badlands were largely formed from ash associated with the eruption of Mount Mazama some 7,700 years ago.〔 〕〔 〕 It is the northwesternmost part of the Northern Basin and Range ecoregion, described as Pluvial Lake Basin, and shares many characteristics of the Great Basin. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oregon Badlands Wilderness」の詳細全文を読む スポンサード リンク
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