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Crommelin Crater is an impact crater in the Oxia Palus quadrangle of Mars, located at 5.1°N latitude and 10.2°W longitude. It is 113.9 km in diameter and was named after Andrew Crommelin, and the name was approved in 1973 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN).〔http://www.google.com/mars/〕 The crater shows many layers. Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers. Groundwater may have been involved in the formation of layers in some places.〔http://www.researchgate.net/profile/Fulvio_Franchi/publication/259470488_GEOMETRY_STRATIGRAPHY_AND_EVIDENCES_FOR_FLUID_EXPULSION_WITHIN_CROMMELIN_CRATER_DEPOSITS_ARABIA_TERRA_MARS/links/53e391300cf23a7ff7496523.pdf〕 〔Franchi, F., A. Rossi, M. Pondrelli, B. Cavalazzi. 2014. Geometry, stratigraphy and evidences for fluid expulsion within Crommelin crater deposits, Arabia Terra, Mars. Planetary and Space Science: 92, 34–48〕 (詳細はdust devil tracks, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of a previous image of Crommelin crater. Wikicrommelinlayeredovals.jpg|Crommelin crater showing layers arranged in the shape of ovals, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of a previous image of Crommelin crater. Wikicrommelincraterlayers.jpg|Crommelin crater showing layers in buttes and inside a small crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of a previous image of Crommelin crater. ESP 035896 1845crommelin.jpg|Crommelin crater, showing layers, as seen by HiRISE Wikiesp 035896 1845crommelinbutte.jpg|Butte in Crommelin Crater, as seen by HiRISE under HiWish program. Location is Oxia Palus quadrangle. Wikiesp 035896 1845crommelinhollows.jpg|Layers in Crommelin Crater, as seen by HiRISE under HiWish program. Location is Oxia Palus quadrangle. Wikiesp 035896 1845crommelinfaults.jpg|Layers in Crommelin Crater, as seen by HiRISE under HiWish program. Arrow indicates fault. Location is Oxia Palus quadrangle. ==Why craters are important== The density of impact craters is used to determine the surface ages of Mars and other solar system bodies.〔http://www.lpi.usra.edu/publications/slidesets/stones/〕 The older the surface, the more craters present. Crater shapes can reveal the presence of ground ice. 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「Crommelin (Martian crater)」の詳細全文を読む スポンサード リンク
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<BR><gallery><BR>Wikicrommelin.jpg|Crommelin (Martian crater), as seen by CTX camera (on Mars Reconnaissance Orbiter).<BR>Wikicrommelinlayersdevils.jpg|Crommelin crater showing layers and <A HREF=){kind=link}