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Palo Duro Canyon is a canyon system of the Caprock Escarpment located in the Texas Panhandle near the city of Amarillo, Texas, United States.〔(TPWD: Palo Duro Canyon )〕 As the second-largest canyon in the United States, it is roughly long and has an average width of , but reaches a width of at places. Its depth is around , but in some locations, it can increase up to . Palo Duro Canyon (from the Spanish meaning "hard stick")〔(Palo Duro Canyon State Park web site )〕 has been named "The Grand Canyon of Texas" both for its size and for its dramatic geological features, including the multicolored layers of rock and steep mesa walls similar to those in the Grand Canyon. The canyon was formed by the Prairie Dog Town Fork of the Red River, which initially winds along the level surface of the Llano Estacado of West Texas, then suddenly and dramatically runs off the Caprock Escarpment. Water erosion over the millennia has shaped the canyon's geological formations. Notable canyon formations include caves and hoodoos. One of the best-known and the major signature feature of the canyon is the Lighthouse Rock. A multiple-use, six-mile round trip loop trail is dedicated to the formation. The middle portion of the trail can be hot with little shade, and hikers should take plenty of water.〔(【引用サイトリンク】title=Logan G. Carver, "Palo Duro Canyon quick getaway from Lubbock" )〕 The painter Georgia O'Keeffe, who lived in nearby Amarillo and Canyon early in the 20th century, wrote of the Palo Duro: "It is a burning, seething cauldron, filled with dramatic light and color."〔Georgia O'Keeffe exhibit, Panhandle-Plains Historical Museum, Canyon, Texas〕 ==History== The first evidence of human habitation of the canyon dates back about 10,000–15,000 years, and it is believed to have been continuously inhabited to the present day. Native Americans were attracted to the water of the Prairie Dog Town Fork, Red River, as well as the consequent ample game, edible plants, and protection from weather the canyon provided. The first European explorers to discover the canyon were members of the Coronado expedition, who visited the canyon in 1541. Apache Indians lived in Palo Duro at the time, but they were later displaced by Comanche and Kiowa tribes, who had the advantage of owning horses brought over by the Spanish. They had contact with traders, called Comancheros, in nearby New Mexico. A United States military team under Captain Randolph B. Marcy mapped the canyon in 1852 during their search for the headwaters of the Red River. The land remained under American Indian control until a military expedition led by Colonel Ranald S. Mackenzie was sent in 1874 to remove the Indians to reservations in Oklahoma. The Mackenzie expedition captured about 1,200 of the Indians' horses and destroyed them in nearby Tule Canyon. The Comanche and Kiowa conceded and left the area. Soon after, in 1876, Charles Goodnight and a wealthy Englishman named John Adair established the JA Ranch in Palo Duro Canyon. Col. Goodnight helped manage the ranch until 1890. Over the next half century, the canyon remained in private hands, but was an increasingly popular tourist spot for local residents. In 1931, a major landowner signed a two-year contract with the local chamber of commerce to allow public access to the canyon.〔Steely, James Wright. ''Parks for Texas: Enduring Landscapes of the New Deal''. Austin: U of Texas, 1999. Print.〕 The upper section of the canyon was purchased by the State of Texas in 1934 and turned into the Palo Duro Canyon State Park. Amarillo is the largest city near Palo Duro Canyon State Park, but the smaller city of Canyon is nearer. ==Renovations underway== Through 2014, the Texas Department of Transportation is constructing bridges at Palo Duro over Water Crossings 1, 2, and 6 to allow motorists easier access during and after heavy rains. Paving work has been completed at the Juniper Multi-use Area, with the addition of utilities pending. By the spring of 2014, day-use campsites and a group pavilion will be added. Meanwhile, plans have begun to turn the Canoncita Ranch house located on the canyon edge into a research center. The old Comanche Trail used by the Civilian Conservation Corps will be restored to extend from the Mack Dick Group Pavilion to Water Crossing 6. The trail will follow the base of Fortress Cliffs. Palo Duro also now offers driving tours in a 12-passenger van for interested sightseers.〔 File:Palo Duro Canyon and Capitol Peak.JPG|Capitol Peak File:Palo Duro 2002.jpg|Terrain of Palo Duro File:Mass Waste Palo Duro 2002.jpg|Landslide at Palo Duro File:Palo Duro lighthouse.jpg|The Lighthouse File:Lighthouse Peak at Palo Duro Canyon.jpg|Another view of the lighthouse peak ==Geology== Palo Duro Canyon was downcut by the Prairie Dog Town Fork tributary of the Red River, during the Pleistocene, when the whole region was uplifted.〔Spearing, Darwin. Roadside Geology of Texas. Missoula: Mountain Press Publishing Co., 1991. ISBN 0-87842-265-X p. 381〕 Most of the strata visible in the Canyon were deposited during the Permian and Triassic periods. From oldest to youngest, the formations are: *Quartermaster Formation: Permian in age, this comprises the red, lower slopes of the Canyon. This layer was deposited in a shallow marine environment that alternated with dry tidal flats, indicated by ripple marks and gypsum evaporite deposits, respectively.〔Spearing, pp. 377, 383〕 *Tecovas Formation: Part of the Dockum Group with the Trujillo Formation, this multicolored Triassic unit consists of shale, siltstone, and sandstone. Deposited in streams and swamps, its colors indicate varying oxidizing conditions, and the alternating dry/wet cycles typical of such environments. These rocks are fossiliferous, containing the remains of phytosaurs, amphibians, and fish.〔Spearing, 384-5〕 *Trujillo Formation: This Triassic formation is harder than the underlying Tecovas, and forms many of the Canyon's ledges. Composed of coarse sandstone, river cross-bedding indicates deposition in a stream environment. Fossils are rare.〔Spearing, pp. 384-5〕 *Ogallala Formation: This late Miocene to early Pliocene unit forms the cliffs and ledges at the very top of the canyon. Composed of sandstone, siltstone, and conglomerate eroded from a late Cenozoic uplift of the Rocky Mountains, it is separated from the lower Trujillo Formation by a disconformity, and a very long hiatus. Fossils of saber-toothed cats (''Smilodon''), bone-crushing dogs (''Borophagines''), mastodons, horses, long-necked camels (''Aepycamelus''), rhinoceroses, and tortoises are present in the Ogallala.〔Spearing, pp. 355-6, 385〕 File:Palo Duro Aeromotor.jpg|Windmill at bottom of canyon on the Prairie Dog Town Fork Red River File:Hiking Trail in Palo Duro Canyon IMG 0110.JPG|Hiking trail to the west of the rancher's dugout in Palo Duro Canyon File:Palo Duro Interpretive Center 2004.jpg|Palo Duro Canyon Interpretive Center built by the Civilian Conservation Corps File:Palo Duro Canyon Highway 207.jpg|Looking north into the canyon, from the south rim, on Highway 207 File:Panorama of the Palo Duro Canyon from the Park road down into the canyon.jpeg|Panoramic view of the Palo Duro Canyon showing the Quartermaster, Tecovas, Trujillo and Ogallala formations 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「Palo Duro Canyon」の詳細全文を読む スポンサード リンク
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