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Scopulus In planetary geology, a scopulus (pl. ''scopuli'', from Greek ''σκόπελος'' "peak"〔Liddell and Scott (1975). ''An Intermediate Greek-English Lexicon;'' Oxford University Press: Oxford, UK, p. 735.〕) is a lobate or irregular escarpment.〔Gazetteer of Planetary Nomenclature. http://planetarynames.wr.usgs.gov/DescriptorTerms.〕 In the early 1970s, the International Astronomical Union (IAU) adopted ''scopulus'' as one of a number of official descriptor terms for topographic features on Mars and other planets and satellites.〔Greeley, R. (1994) ''Planetary Landscapes,'' 2nd ed.; Chapman & Hall: New York, pp. 35-36.〕 One justification for using neutral Latin or Greek descriptors was that it allowed features to be named and described before their geology or geomorphology could be determined.〔Russell, J.F.; Snyder, C.W.; Kieffer, H.H. (1992). Origin and Use of Martian Nomenclature in ''Mars,'' H.H. Kieffer et al., Eds.; University of Arizona Press: Tucson, AZ, p. 1310.〕 Currently, the IAU recognizes 54 descriptor terms. (See Planetary nomenclature.) Thirteen features with the descriptor term scopulus are present on Mars. ==References==
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