A Large Paleolake Basin at the Head of Ma'adim Vallis, Mars

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Science  21 Jun 2002:
Vol. 296, Issue 5576, pp. 2209-2212
DOI: 10.1126/science.1071143

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At 8 to 15 kilometers wide, Ma'adim Vallis is one of the largest valleys in the martian highlands. Although a groundwater source was previously suggested, the channel originates at a spillway in the divide of a ∼3,000,000-square-kilometer closed drainage basin. The interior morphology of this source basin, including likely shoreline features following topographic contours, suggests that Ma'adim Vallis was created through catastrophic overflow of a ∼1,100,000-square-kilometer highland lake. The size, constant levels, and interior morphology of three regional paleolake basins require a warmer paleoclimate and a long-term, recharged, stable highland water table more than ∼3.5 billion years ago.

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