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Titus Canyon is a deep, narrow gorge cut into the steep face of the Grapevine Mountains of the Mojave Desert, within Death Valley National Park in southeastern California and southwestern Nevada. The canyon features limestone rock formations, petroglyphs, and native plants and wildlife.〔(【引用サイトリンク】 work=U.S. National Park Service )〕 〔( DesertUSA Blog: Titus Canyon in Death Valley National Park ) . accessed 4.5.2015〕 ==Geology== Although the Grapevine Mountains were uplifted relatively recently, most of the rocks that make up the range are over half a billion years old. The gray rocks lining the walls of the western end of Titus Canyon are Cambrian age (570–505 million years old) limestone. These ancient Paleozoic rocks formed at a time when the Death Valley area was submerged beneath tropical seas. By the end of the Precambrian, the continental edge of North America had been planed off by erosion to a gently rounded surface of low relief. The rise and fall of the Cambrian seas periodically shifted the shoreline eastward, flooding the continent, then regressed westward, exposing the limestone layers to erosion. The sediments have since been upturned, upfolded (forming anticlines), downfolded (forming synclines) and folded back onto themselves (forming recumbent folds). Although some of the limestone exposed in the walls of Titus Canyon originated from thick mats of algae (stromatolites) that thrived in the warm, shallow Death Valley seas, most of the gray limestone shows little structure. Thousands of feet (hundreds of meters) of this limey goo were deposited in the Death Valley region. Similar limestone layers may be seen at Lake Mead National Recreation Area and at the bottom of the Grand Canyon. At one of the bends in the canyon, megabreccia can be seen. ==History== Timbisha Native Americans carved petroglyphs on some of the rock faces in Titus Canyon, especially near natural springs. ;Ghost towns Adjacent to the canyon proper is Leadfield, a former mining town and now ghost town where in the 1920s prospectors mined for ore after hearing exaggerated claims that lead would be easy to find and the living conditions in the area would be easy to endure. Another mining town-ghost town dating from the early 20th century, Rhyolite, Nevada, on the Tonopah and Tidewater Railroad, is also nearby to the east. 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「Titus Canyon」の詳細全文を読む スポンサード リンク
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