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Oxia Planum is a plain located on Mars (near ) that has been chosen as a preferred landing location for the ExoMars rover, with an elevation more than 3000 meters below the Martian mean.〔(ESA mission updates ). Emily Lakdawalla; 5 November 2015.〕 Oxia Planum contains one of the largest exposures of clay-bearing rocks and are around 3.9 billion years old.〔 〕 The site is iron-magnesium rich clays, indicating that water once played a role here. The site sits in an area of valley systems with the exposed rocks exhibiting different compositions, indicating a variety of deposition and wetting environments. Clay accumulation underneath the remnants of a fan or delta near the outlet of Coogoon Vallis may offer preservation for biosignatures against the planet's harsh radiation and oxidation environment.〔 ==See also== *Geography of Mars *List of plains on Mars 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「Oxia Planum」の詳細全文を読む スポンサード リンク
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