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The Franklin Mountains of Texas are a small range (23 miles long, wide) that extend from El Paso, Texas north into New Mexico.〔Van Hise, C.R. and Leith, C.K. 1909. Pre-Cambrian Geology of North America. United States Geological Survey, Bulletin 360, 939 pp. (See pp. 746-748)〕 The Franklins were formed due to crustal extension related to the Cenozoic Rio Grande rift. Although the present topography of the range and adjoining basins is controlled by extension during rifting in the last 10 million years, faults within the range also record deformation during the Laramide orogeny, between 85 and 45 million years ago. The highest peak is North Franklin Peak at . Much of the range is part of the Franklin Mountains State Park. The mountains are composed primarily of sedimentary rock with some igneous intrusions. Geologists refer to them as tilted-block fault mountains and in them can be found 1.25 billion-year-old〔http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_br_p4501_0124g.pdf Precambrian rocks can be seen in the Tom Mays unit of the Franklin Mountains park〕 Precambrian rocks, the oldest in Texas.〔〔Brooks, A.H. 1904. The Geological Society of Washington. Science NS 19(490):794-796.〕 ==Gallery== File:Richardson 1908 FranklinMts.jpg|View of the south end of Franklin Mountains from El Paso, showing the abrupt termination of the range, its westward dip slope and terraced bolson deposits on each side. (1908)〔Richardson, G.B. 1909. El Paso folio, Texas. United States Geological Survey, Folios of the Geologic Atlas, No. 166, 11 pp. (See Figure 10) 〕 File:FranklinMountains,ElPaso,asSeenFromFtBliss.JPG|South and North Franklin Mountains, shown left to right, El Paso, Texas, as seen from Fort Bliss. The Organ Mountains can be glimpsed to the north, in the right part of the image. File:SFranklin2.jpg|View of South Franklin Mountain (aka Mount Franklin) (29 March 2009) File:Franklin Moutains from Ranger Peak.jpg|Franklin Mountains with Northwest El Paso in the background File:Texas Franklin Mountains.JPG|North Franklin Mountains in November File:Summitanthonysnose1b.jpg|North Franklin Mountain File:ElpasoSNOW.JPG|Snow on Franklin Mountains & El Paso causes a closure of Transmountain Highway File:Franklin Mountain Snow.jpg|Snow on Franklin Mountains File:Aztec Caves.jpg|View of the Aztec Caves, as accessed from the Aztec Caves trail at the Franklin Mountains State Park, Tom Mays unit. 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「Franklin Mountains (Texas)」の詳細全文を読む スポンサード リンク
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