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Nilokeras Scopulus
Nilokeras Scopulus is a long escarpment (cliff) in the northern hemisphere of the planet Mars. It is located along the southeastern boundary of the Tempe Terra plateau and forms the northern valley wall (wallrock boundary) of the downstream portion of the immense Kasei Valles outflow channel system. The escarpment is 765 km long 〔USGS Gazetter of Planetary Nomenclature. http://planetarynames.wr.usgs.gov/Feature/4277.〕 and ranges from 1 to a little over 2 km (3300–6600 ft) in height.〔Mars Orbital Laser Altimeter (MOLA) gridded dataset from JMars. (cf. Christensen, P. et al. (2007). New Insights about Mars from the Creation and Analysis of Mars Global Datasets. American Geophysical Union, abstract #P11E-01. http://adsabs.harvard.edu/abs/2007AGUFM.P11E..01C.)〕
For most of its length, Nilokeras Scopulus lies between lat. 31° and 32° N. It trends west-east, extending from approximately long. 297° to 309° E.〔 The escarpment curves northward at the eastern edge of Tempe Terra where the northern segment of Kasei Valles debouches into Chryse and southwestern Acidalia Planitiae.
==Name origin==
Nilokeras, which is Greek for "horn of the Nile," was the name given by astronomer E. M. Antoniadi in 1930 to a telescopic albedo feature and canal centered at lat. 30° N., long. 55° W. (See List of Martian canals.) Scopulus is a descriptor term used in planetary geology for an irregular escarpment or cliff. The International Astronomical Union (IAU) formally adopted the name Nilokeras Scopulus in 1976.〔 Scopulus is the Latin term for "crag" or cliff.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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